Sir-Uli

This plugin provides a possibility to block comments based on words of a predefined list. The built-in lists of wordpress only allow to send comments to the moderation- or to the spam-queue but not to block them completely. This is remedied with this plugin, which allows to block comments based on a definable list.
Attention #1: Use wordlist with care, there is no logging of the blocked comments!
Attention #2: It will also match inside words, so “press” will match “WordPress” as well!

WU – Block comments

This plugin provides a possibility to block comments based on words of a predefined list.

AcyMailing Newsletter Team

AcyChecker is a mailing list cleaning service (email checker) created by the AcyMailing (a WordPress newsletter plugin) team.
This email checker allows you to improve the deliverability of your emails, to reduce your costs or to keep a good reputation by using its WordPress (or Joomla) plugin or its API.
This email checker allows the verification of emails at different levels:
<ul>
<li>Domain and SMTP check</li>
<li>Role email checker</li>
<li>Disposable email checker</li>
<li>Free provider</li>
<li>Email format checker</li>
<li>In-depth tests</li>
</ul>
Why should you clean up your mailing list with an email checker?
1 – Improve deliverability 
2 – Have a good reputation 
3 – Reduce your costs 
4 – Improve your open rates 
5 – Avoid bounces

Anti Spam and list cleaner – AcyChecker

Block fake accounts and delete users using a fake email address

WU – Block comments vs Anti Spam and list cleaner – AcyChecker