Talisa @ Page Authority

Allowed Email Domains gives administrators a simple way to restrict WordPress user accounts to approved email domains.
The plugin is designed for sites where only users from specific organizations, companies, clients, or teams should be added as WordPress users.
Features include:
<ul>
<li>Admin-managed allowed domain list</li>
<li>Standard WordPress registration enforcement</li>
<li>REST API user creation/update enforcement</li>
<li>WooCommerce registration enforcement</li>
<li>Existing User Audit tools</li>
<li>Optional login enforcement</li>
<li>Per-user unauthorized account removal with content reassignment</li>
<li>Multisite-aware protections</li>
<li>Lightweight architecture with no custom database tables</li>
</ul>
<h3>Security Notes</h3>
The plugin includes:
<ul>
<li>Capability checks</li>
<li>Nonce verification (verified before any state-changing logic runs)</li>
<li>Sanitization and escaping</li>
<li>Live revalidation before destructive actions</li>
<li>Current-admin protection</li>
<li>Multisite Super Admin protection</li>
<li>Explicit content reassignment or delete confirmation before user removal</li>
</ul>
Recommended operational practices:
<ul>
<li>Review the Existing User Audit before enabling login blocking</li>
<li>Test custom registration and SSO flows before production rollout</li>
<li>Maintain regular database backups before deleting users</li>
<li>Restrict plugin management access to trusted administrators only</li>
</ul>
<h3>Uninstall</h3>
Deleting the plugin removes its current options:
<ul>
<li><code>pageauth_allowed_domains</code></li>
<li><code>pageauth_audit_log</code></li>
<li><code>pageauth_block_unauthorized_logins</code></li>
</ul>
It also cleans up internal flags, transients, user meta, and any leftover keys from prior plugin versions that used the <code>paad_</code> or <code>aed_</code> prefixes. On multisite, the matching network options are removed as well.

Page Authority – Allowed Domains

Restrict WordPress user accounts to administrator-approved email domains.

shelkie

Manage multiple blogs with a single standard WordPress installation. Each may have its own theme and domain while sharing users and administration.
Handy for situations where multiple blogs or domains are required, but WordPress MU seems like overkill. MiniMU adds this functionality without added complexity or administration headaches.
By associating a WordPress category with each of your domains, you’re able to control where your posts and pages appear. Have some posts and pages show up on a single domain, and others be visible on all domains. Simply assign the appropriate categories to your posts and pages to control where they appear.
You are able to select a different theme for each MiniMU domain if so desired. Additionally, you’re able to change the Blog title and Tagline for each. Often, it’s desirable to include other bits of content that vary by domain. MiniMU allows you to create custom “variables”, and assign unique content for each domain. These bits of custom content may be plain text or HTML.

MiniMU

Manage multiple blogs with a single standard WordPress installation. Each may have its own theme and domain while sharing users and administration.

Page Authority – Allowed Domains vs MiniMU