diff --git a/src/backend/controllers/auth/AuthController.ts b/src/backend/controllers/auth/AuthController.ts
index bc3d659bf..3149459bc 100644
--- a/src/backend/controllers/auth/AuthController.ts
+++ b/src/backend/controllers/auth/AuthController.ts
@@ -823,6 +823,16 @@ export class AuthController extends PuterController {
             email_confirm_token: null,
         });
 
+        // Revoke confirmation from any other accounts sharing this
+        // email so only the account whose owner just proved inbox
+        // access retains verified status.
+        const canonical = cleanEmail(user.email!);
+        await this.stores.user.unconfirmOthersByEmail(
+            user.id,
+            user.email!,
+            canonical,
+        );
+
         await promoteToVerifiedGroup(this.stores.group, this.config, user);
 
         try {
diff --git a/src/backend/stores/user/UserStore.ts b/src/backend/stores/user/UserStore.ts
index 11c068a65..04d8531c6 100644
--- a/src/backend/stores/user/UserStore.ts
+++ b/src/backend/stores/user/UserStore.ts
@@ -419,6 +419,25 @@ export class UserStore extends PuterStore {
         }
     }
 
+    async unconfirmOthersByEmail(
+        userId: number,
+        email: string,
+        cleanEmailValue: string,
+    ): Promise<void> {
+        await this.clients.db.write(
+            `UPDATE \`user\`
+                SET \`email\` = NULL,
+                    \`clean_email\` = NULL,
+                    \`email_confirmed\` = 0,
+                    \`requires_email_confirmation\` = 0,
+                    \`email_confirm_code\` = NULL,
+                    \`email_confirm_token\` = NULL
+              WHERE \`id\` != ?
+                AND (\`email\` = ? OR \`clean_email\` = ?)`,
+            [userId, email, cleanEmailValue],
+        );
+    }
+
     async invalidate(user: UserRow): Promise<void> {
         const keys = this.#cacheKeysForUser(user);
         await this.publishCacheKeys({ keys, broadcast: true });