r-a-y

User registration spam is prevalent in BuddyPress.
One way to dramatically decrease signup spam is to restrict the email address domains that users can sign up with.
WordPress multisite has a native option called “Limited Email Registrations”. But this option requires you to enter the full email domain. For example, if you only wanted to allow .edu email addresses to register, this is not possible.
This plugin restricts registrations to the email domains that you are not specified in the blacklist and works in WordPress single-site and multi-site.
Plugin is a fork of r-a-y’s BP Restrict Signup by Email Domain.
Tested on BuddyPress 2.5, but should work all the way down to BuddyPress 1.6.

BP Blacklist Signup by Email Domain

Only allow users with email addresses not on the domain blacklist to register in BuddyPress.

Umar Jameel

SpamLock helps you prevent unwanted submissions in Elementor Pro forms by blocking specific email addresses, domains, or IP addresses.
⚠️ This plugin requires Elementor Pro (Elementor Forms feature).
With a simple admin interface, you can easily manage your blacklist and protect your website from spam and abuse.
<h4>Features</h4>
<ul>
<li>Block specific email addresses</li>
<li>Block entire domains (e.g. gmail.com)</li>
<li>Block IP addresses</li>
<li>Custom error message for blocked users</li>
<li>Export blacklist as CSV</li>
<li>Lightweight and easy to use</li>
</ul>

SpamLock – Email, Domain & IP Blacklist for Elementor Forms

Block Elementor Pro form submissions using email, domain, or IP blacklist.

BP Blacklist Signup by Email Domain vs SpamLock – Email, Domain & IP Blacklist for Elementor Forms