The WordPress Restrict Email Domains plugin by BuddyDev is a lightweight yet robust administrative tool designed to whitelist or blacklist user registrations based on specific email criteria. It is particularly popular for intranets, educational institutions, and private corporate communities.
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WordPress Version: Compatible with WordPress 4.5+ (Tested up to 6.9+).
PHP Version: Compatible with PHP 5.6 through PHP 8.x.
Multisite Support: Fully compatible with WordPress Multisite (Network) installations.
BuddyPress/BuddyBoss: Native deep integration for social community registrations.
E-commerce/Membership Integration: Works seamlessly with WooCommerce, Paid Memberships Pro, Ultimate Member, UsersWP, and WP-Members.
The plugin operates primarily as a whitelist tool, meaning only the domains or addresses you specify will be allowed to register.
| Feature | Description |
| Domain Restriction | Restrict signups to specific domains (e.g., company.com). |
| Extension Support | Limit registration to TLDs (e.g., .edu or .gov). |
| Individual Whitelisting | Allow specific full email addresses (e.g., [email protected]) while blocking the rest of the domain. |
| Custom Error Messages | Define the specific text users see when their email is rejected. |
| Case Insensitivity | Validates emails regardless of uppercase/lowercase input. |
| Regex Flexibility | Uses regular expressions for efficient, flexible pattern matching. |
Admin Location: Settings are managed under Dashboard > Settings > Restrict Email Domains.
Input Format: Entries must be added one per line. No commas or special delimiters are required.
Database Storage: Settings are stored in the WordPress options table as a longtext field. Technically, this allows for a massive number of entries (theoretically up to 4GB), though performance may decrease if managing over 100,000 individual emails due to array loading.
