diff --git a/src/app/(admin)/settings/email/mailbox-settings-form.tsx b/src/app/(admin)/settings/email/mailbox-settings-form.tsx
index 1c04479..5682169 100644
--- a/src/app/(admin)/settings/email/mailbox-settings-form.tsx
+++ b/src/app/(admin)/settings/email/mailbox-settings-form.tsx
@@ -9,6 +9,7 @@ interface Status {
   user: string | null;
   imapHost: string | null;
   allowInsecureTls: boolean;
+  fromAddress: string | null;
   verifiedAt: number | null;
 }
 
@@ -19,6 +20,7 @@ export function MailboxSettingsForm({ initialStatus }: { initialStatus: Status }
   const [smtpPort, setSmtpPort] = useState("587");
   const [user, setUser] = useState(initialStatus.user ?? "");
   const [password, setPassword] = useState("");
+  const [fromAddress, setFromAddress] = useState(initialStatus.fromAddress ?? "");
   const [allowInsecureTls, setAllowInsecureTls] = useState(true);
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
@@ -38,6 +40,7 @@ export function MailboxSettingsForm({ initialStatus }: { initialStatus: Status }
         user,
         password,
         allowInsecureTls,
+        fromAddress,
       }),
     });
 
@@ -48,7 +51,15 @@ export function MailboxSettingsForm({ initialStatus }: { initialStatus: Status }
       return;
     }
 
-    setStatus({ configured: true, enabled: true, user, imapHost: host, allowInsecureTls, verifiedAt: Date.now() });
+    setStatus({
+      configured: true,
+      enabled: true,
+      user,
+      imapHost: host,
+      allowInsecureTls,
+      fromAddress: fromAddress || null,
+      verifiedAt: Date.now(),
+    });
     setPassword("");
   }
 
@@ -131,6 +142,21 @@ export function MailboxSettingsForm({ initialStatus }: { initialStatus: Status }
           />
         </label>
 
+        <label className="mb-3 block text-sm">
+          <span className="mb-1 block font-medium text-text-muted">Адрес отправителя (если отличается от логина)</span>
+          <input
+            type="email"
+            value={fromAddress}
+            onChange={(e) => setFromAddress(e.target.value)}
+            placeholder="support@zaglushka.ru"
+            className="w-full rounded-md border border-border bg-surface px-3 py-2 text-sm outline-none focus:border-accent"
+          />
+          <span className="mt-1 block text-xs text-text-faint">
+            Нужно, если логин — служебная учётка (напр. AD UPN), а письма клиенту должны уходить от другого адреса.
+            Оставьте пустым, если логин и есть нужный адрес.
+          </span>
+        </label>
+
         <label className="mb-4 flex items-center gap-2 text-sm text-text-muted">
           <input
             type="checkbox"
diff --git a/src/app/api/mailbox/config/route.ts b/src/app/api/mailbox/config/route.ts
index 6d92022..b8dc8c1 100644
--- a/src/app/api/mailbox/config/route.ts
+++ b/src/app/api/mailbox/config/route.ts
@@ -21,6 +21,7 @@ const configureSchema = z.object({
   user: z.string().email(),
   password: z.string().min(1),
   allowInsecureTls: z.boolean(),
+  fromAddress: z.string().email().optional().or(z.literal("")),
 });
 
 export async function POST(request: Request) {
@@ -41,6 +42,7 @@ export async function POST(request: Request) {
     user: parsed.data.user,
     password: parsed.data.password,
     allowInsecureTls: parsed.data.allowInsecureTls,
+    fromAddress: parsed.data.fromAddress || undefined,
   };
 
   try {
diff --git a/src/lib/db/migrations/0013_military_ezekiel_stane.sql b/src/lib/db/migrations/0013_military_ezekiel_stane.sql
new file mode 100644
index 0000000..44a7498
--- /dev/null
+++ b/src/lib/db/migrations/0013_military_ezekiel_stane.sql
@@ -0,0 +1 @@
+ALTER TABLE `mailbox_config` ADD `from_address` text;
\ No newline at end of file
diff --git a/src/lib/db/migrations/meta/0013_snapshot.json b/src/lib/db/migrations/meta/0013_snapshot.json
new file mode 100644
index 0000000..48d85b7
--- /dev/null
+++ b/src/lib/db/migrations/meta/0013_snapshot.json
@@ -0,0 +1,1216 @@
+{
+  "version": "6",
+  "dialect": "sqlite",
+  "id": "c6078d1b-f714-4a76-8a92-75ae41b29c5b",
+  "prevId": "9b718db3-0850-45e1-97d4-38655d6400f0",
+  "tables": {
+    "attachments": {
+      "name": "attachments",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "message_id": {
+          "name": "message_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "filename": {
+          "name": "filename",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "mime_type": {
+          "name": "mime_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "size_bytes": {
+          "name": "size_bytes",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "storage_key": {
+          "name": "storage_key",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "content_id": {
+          "name": "content_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "is_inline": {
+          "name": "is_inline",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "attachments_message_id_messages_id_fk": {
+          "name": "attachments_message_id_messages_id_fk",
+          "tableFrom": "attachments",
+          "tableTo": "messages",
+          "columnsFrom": [
+            "message_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "canned_responses": {
+      "name": "canned_responses",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "title": {
+          "name": "title",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "body": {
+          "name": "body",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "customers": {
+      "name": "customers",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "email": {
+          "name": "email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "telegram_chat_id": {
+          "name": "telegram_chat_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "portal_token": {
+          "name": "portal_token",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {
+        "customers_telegram_chat_id_unique": {
+          "name": "customers_telegram_chat_id_unique",
+          "columns": [
+            "telegram_chat_id"
+          ],
+          "isUnique": true
+        },
+        "customers_portal_token_unique": {
+          "name": "customers_portal_token_unique",
+          "columns": [
+            "portal_token"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "ldap_config": {
+      "name": "ldap_config",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "host": {
+          "name": "host",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "port": {
+          "name": "port",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 389
+        },
+        "use_tls": {
+          "name": "use_tls",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "bind_dn": {
+          "name": "bind_dn",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "bind_password_enc": {
+          "name": "bind_password_enc",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "base_dn": {
+          "name": "base_dn",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_filter": {
+          "name": "user_filter",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'(mail={{email}})'"
+        },
+        "list_filter": {
+          "name": "list_filter",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'(objectClass=person)'"
+        },
+        "default_role": {
+          "name": "default_role",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'agent'"
+        },
+        "enabled": {
+          "name": "enabled",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "verified_at": {
+          "name": "verified_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "login_challenges": {
+      "name": "login_challenges",
+      "columns": {
+        "token_hash": {
+          "name": "token_hash",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "attempts": {
+          "name": "attempts",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "login_challenges_user_id_users_id_fk": {
+          "name": "login_challenges_user_id_users_id_fk",
+          "tableFrom": "login_challenges",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "mailbox_config": {
+      "name": "mailbox_config",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "imap_host": {
+          "name": "imap_host",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "imap_port": {
+          "name": "imap_port",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 993
+        },
+        "smtp_host": {
+          "name": "smtp_host",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "smtp_port": {
+          "name": "smtp_port",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 587
+        },
+        "user": {
+          "name": "user",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "password_enc": {
+          "name": "password_enc",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "from_address": {
+          "name": "from_address",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "allow_insecure_tls": {
+          "name": "allow_insecure_tls",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "enabled": {
+          "name": "enabled",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "verified_at": {
+          "name": "verified_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "messages": {
+      "name": "messages",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "ticket_id": {
+          "name": "ticket_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "author_type": {
+          "name": "author_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "author_id": {
+          "name": "author_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "author_name": {
+          "name": "author_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "body": {
+          "name": "body",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "body_html": {
+          "name": "body_html",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "direction": {
+          "name": "direction",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "visibility": {
+          "name": "visibility",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'public'"
+        },
+        "email_message_id": {
+          "name": "email_message_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "delivery_failed": {
+          "name": "delivery_failed",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "messages_ticket_id_tickets_id_fk": {
+          "name": "messages_ticket_id_tickets_id_fk",
+          "tableFrom": "messages",
+          "tableTo": "tickets",
+          "columnsFrom": [
+            "ticket_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "push_subscriptions": {
+      "name": "push_subscriptions",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "endpoint": {
+          "name": "endpoint",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "p256dh": {
+          "name": "p256dh",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "auth": {
+          "name": "auth",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_agent": {
+          "name": "user_agent",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {
+        "push_subscriptions_endpoint_unique": {
+          "name": "push_subscriptions_endpoint_unique",
+          "columns": [
+            "endpoint"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "push_subscriptions_user_id_users_id_fk": {
+          "name": "push_subscriptions_user_id_users_id_fk",
+          "tableFrom": "push_subscriptions",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "sessions": {
+      "name": "sessions",
+      "columns": {
+        "token_hash": {
+          "name": "token_hash",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "sessions_user_id_users_id_fk": {
+          "name": "sessions_user_id_users_id_fk",
+          "tableFrom": "sessions",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "tags": {
+      "name": "tags",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "color": {
+          "name": "color",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'accent'"
+        },
+        "is_default": {
+          "name": "is_default",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {
+        "tags_name_unique": {
+          "name": "tags_name_unique",
+          "columns": [
+            "name"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "telegram_config": {
+      "name": "telegram_config",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "bot_token_enc": {
+          "name": "bot_token_enc",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "bot_username": {
+          "name": "bot_username",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "enabled": {
+          "name": "enabled",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "verified_at": {
+          "name": "verified_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "ticket_tags": {
+      "name": "ticket_tags",
+      "columns": {
+        "ticket_id": {
+          "name": "ticket_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "tag_id": {
+          "name": "tag_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "ticket_tags_ticket_id_tickets_id_fk": {
+          "name": "ticket_tags_ticket_id_tickets_id_fk",
+          "tableFrom": "ticket_tags",
+          "tableTo": "tickets",
+          "columnsFrom": [
+            "ticket_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "ticket_tags_tag_id_tags_id_fk": {
+          "name": "ticket_tags_tag_id_tags_id_fk",
+          "tableFrom": "ticket_tags",
+          "tableTo": "tags",
+          "columnsFrom": [
+            "tag_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {
+        "ticket_tags_ticket_id_tag_id_pk": {
+          "columns": [
+            "ticket_id",
+            "tag_id"
+          ],
+          "name": "ticket_tags_ticket_id_tag_id_pk"
+        }
+      },
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "tickets": {
+      "name": "tickets",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "subject": {
+          "name": "subject",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "status": {
+          "name": "status",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'new'"
+        },
+        "priority": {
+          "name": "priority",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'normal'"
+        },
+        "channel": {
+          "name": "channel",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "customer_id": {
+          "name": "customer_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "assignee_id": {
+          "name": "assignee_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "last_message_at": {
+          "name": "last_message_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "tickets_customer_id_customers_id_fk": {
+          "name": "tickets_customer_id_customers_id_fk",
+          "tableFrom": "tickets",
+          "tableTo": "customers",
+          "columnsFrom": [
+            "customer_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "tickets_assignee_id_users_id_fk": {
+          "name": "tickets_assignee_id_users_id_fk",
+          "tableFrom": "tickets",
+          "tableTo": "users",
+          "columnsFrom": [
+            "assignee_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "totp_recovery_codes": {
+      "name": "totp_recovery_codes",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "code_hash": {
+          "name": "code_hash",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "used_at": {
+          "name": "used_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "totp_recovery_codes_user_id_users_id_fk": {
+          "name": "totp_recovery_codes_user_id_users_id_fk",
+          "tableFrom": "totp_recovery_codes",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "users": {
+      "name": "users",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "email": {
+          "name": "email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "password_hash": {
+          "name": "password_hash",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "role": {
+          "name": "role",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'agent'"
+        },
+        "auth_source": {
+          "name": "auth_source",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'local'"
+        },
+        "totp_secret": {
+          "name": "totp_secret",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "totp_enabled": {
+          "name": "totp_enabled",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {
+        "users_email_unique": {
+          "name": "users_email_unique",
+          "columns": [
+            "email"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "widget_sites": {
+      "name": "widget_sites",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "site_key": {
+          "name": "site_key",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "allowed_origin": {
+          "name": "allowed_origin",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "enabled": {
+          "name": "enabled",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch('subsec') * 1000)"
+        }
+      },
+      "indexes": {
+        "widget_sites_site_key_unique": {
+          "name": "widget_sites_site_key_unique",
+          "columns": [
+            "site_key"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    }
+  },
+  "views": {},
+  "enums": {},
+  "_meta": {
+    "schemas": {},
+    "tables": {},
+    "columns": {}
+  },
+  "internal": {
+    "indexes": {}
+  }
+}
\ No newline at end of file
diff --git a/src/lib/db/migrations/meta/_journal.json b/src/lib/db/migrations/meta/_journal.json
index 991ddd1..69a073b 100644
--- a/src/lib/db/migrations/meta/_journal.json
+++ b/src/lib/db/migrations/meta/_journal.json
@@ -92,6 +92,13 @@
       "when": 1791361267938,
       "tag": "0012_flawless_lord_tyger",
       "breakpoints": true
+    },
+    {
+      "idx": 13,
+      "version": "6",
+      "when": 1791367080545,
+      "tag": "0013_military_ezekiel_stane",
+      "breakpoints": true
     }
   ]
 }
\ No newline at end of file
diff --git a/src/lib/db/schema.ts b/src/lib/db/schema.ts
index fe5906e..d59a47f 100644
--- a/src/lib/db/schema.ts
+++ b/src/lib/db/schema.ts
@@ -174,6 +174,13 @@ export const mailboxConfig = sqliteTable("mailbox_config", {
   smtpPort: integer("smtp_port").notNull().default(587),
   user: text("user").notNull(),
   passwordEnc: text("password_enc").notNull(),
+  // Null unless the SMTP AUTH identity can't send as itself — e.g. an
+  // on-prem/hybrid M365 setup where `user` is the AD UPN used to log in
+  // (like elsup@zag.lan) but the mailbox's actual permitted "From" address
+  // is a different, customer-facing domain. Exchange Online rejects a
+  // mismatched From with "550 5.7.60 ... does not have permissions to send
+  // as this sender" — see sendTicketReplyEmail. Defaults to `user` when unset.
+  fromAddress: text("from_address"),
   // Both IMAP and SMTP presented an expired cert on support@top-sysops.ru at
   // setup time. This is a LAN-only mailbox (never exposed to the internet),
   // so skipping verification is an accepted risk — not a default for
diff --git a/src/lib/mail/config.ts b/src/lib/mail/config.ts
index 4e78d10..ceae523 100644
--- a/src/lib/mail/config.ts
+++ b/src/lib/mail/config.ts
@@ -11,6 +11,9 @@ export interface MailboxSettings {
   user: string;
   password: string;
   allowInsecureTls: boolean;
+  // See the schema comment on mailboxConfig.fromAddress — undefined means
+  // "same as user", the common case.
+  fromAddress?: string;
 }
 
 /** Settings for the running listener/sender — null if never configured or disabled. */
@@ -26,6 +29,7 @@ export async function getMailboxSettings(): Promise<MailboxSettings | null> {
     user: config.user,
     password: decryptCredential(config.passwordEnc),
     allowInsecureTls: config.allowInsecureTls,
+    fromAddress: config.fromAddress ?? undefined,
   };
 }
 
@@ -38,6 +42,7 @@ export async function saveMailboxSettings(settings: MailboxSettings): Promise<vo
     user: settings.user,
     passwordEnc: encryptCredential(settings.password),
     allowInsecureTls: settings.allowInsecureTls,
+    fromAddress: settings.fromAddress || null,
     enabled: true,
     verifiedAt: new Date(),
   };
@@ -65,6 +70,7 @@ export async function getMailboxStatus() {
     user: config?.user ?? null,
     imapHost: config?.imapHost ?? null,
     allowInsecureTls: config?.allowInsecureTls ?? false,
+    fromAddress: config?.fromAddress ?? null,
     verifiedAt: config?.verifiedAt?.getTime() ?? null,
   };
 }
diff --git a/src/lib/mail/smtp.ts b/src/lib/mail/smtp.ts
index 968b2c5..d8a171a 100644
--- a/src/lib/mail/smtp.ts
+++ b/src/lib/mail/smtp.ts
@@ -32,11 +32,12 @@ export async function sendTicketReplyEmail(params: {
   const settings = await getMailboxSettings();
   if (!settings) throw new Error("Email channel is not configured");
 
-  const messageId = `<${crypto.randomUUID()}@${settings.user.split("@")[1] ?? "top-sysops.ru"}>`;
+  const fromAddress = settings.fromAddress || settings.user;
+  const messageId = `<${crypto.randomUUID()}@${fromAddress.split("@")[1] ?? "top-sysops.ru"}>`;
   const subject = params.subject.toLowerCase().startsWith("re:") ? params.subject : `Re: ${params.subject}`;
 
   await createTransport(settings).sendMail({
-    from: settings.user,
+    from: fromAddress,
     to: params.to,
     subject,
     text: params.body,