WP-Mail-Validator is an anti-spam plugin. It provides mail-address validation in 5 ways:

IsTempMail

Block Temporary Email

This plugin stops users from giving you disposable or fake email addresses when signing up. This helps reduce spam and fraud.

kimpenhaus

<p>WP-Mail-Validator is an anti-spam plugin. It provides mail-address validation in 5 ways:</p>
<ol>
<li>syntax of mail-addresses</li>
<li>mailserver host</li>
<li>mx-record of mailserver</li>
<li>user-defined blacklist</li>
<li>trashmail services</li>
</ol>
<p>Once the plugin identifies a mail-address to be non existing on the mailserver or being on the blacklist or<br />
from trashmail service, any comment being made is moved to the spam area awaiting moderation from the blog owner.</p>
<h3>Theme-Modification</h3>
<p>WP-Mail-Validator comes with 3 theme functions that can be used:</p>
<ol>
<li><code>wp_mail_validator_info_label()</code>: shows a protected by info label</li>
<li><code>wp_mail_validator_version()</code>: shows the current plugin version</li>
<li><code>wp_mail_validator_fended_spam_attack_count()</code>: shows the count of spam attackes fended</li>
</ol>


Alternatives to WP-Mail-Validator

Top alternatives