script to update all email domains

Author: SumithThota

Specialized Areas/Fix scripts/Mass Email Domain Update/README.md

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+# Update User Email Domain in ServiceNow
+
+This script finds all users in the **`sys_user`** table whose email addresses contain an old domain (e.g. `bad_domain.com`) and replaces it with a new domain (e.g. `new_domain.com`) using **regular expressions**.
+
+---
+
+## Purpose
+
+To bulk–update user email domains safely and efficiently without manual edits.
+
+Example use case:
+ When your organization migrates from `@bad_domain.com` to `@new_domain.com`, this script updates all users automatically.
+
+---
+
+## Example
+| Old Email              | New Email              |
+|-------------------------|------------------------|
+| alice@bad_domain.com    | alice@new_domain.com   |
+| bob@bad_domain.com      | bob@new_domain.com     |
+| carol@bad_domain.com    | carol@new_domain.com   |
+

Specialized Areas/Fix scripts/Mass Email Domain Update/script.js

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+// Use: Fix script to update all email domains in sys_user table
+// Replaces 'bad_domain.com' with 'new_domain.com' in email field
+
+var usr = new GlideRecord('sys_user');
+usr.addEncodedQuery('emailLIKEbad_domain.com'); // find users with old domain
+usr.query();
+
+while (usr.next()) {
+    gs.print('OLD EMAIL: ' + usr.email);
+
+    // Create regex to match old domain
+    var regex = new SNC.Regex('bad_domain\\.com'); // uses '\\' to escape dot for regex
+    // Use replaceAll method to substitute
+    usr.email = regex.replaceAll(usr.email, 'new_domain.com');
+    usr.update();
+    gs.print('NEW EMAIL: ' + usr.email);
+}