Martin Lormes

If a comment is held for moderation an email message is sent to the comment author with a link to verify the comment author’s email address. When the comment author clicks on that link the comment gets approved immediately. This makes discussions more lively as users don’t have to wait for the blog admin to approve the comment.
Blog owners may also choose to hold the comments in the moderation queue even after successful verification. The verification status is shown in the comment lists in the admin.
If an author has a previously approved comment and his comments gets approved automatically according to the ‘comment_whitelist’ option in WordPress no email is sent.
If a comment is classified as spam by Akismet or another anti-spam plugin no email is sent.
This plugin uses the <code>commentmeta</code> table and thus requires WordPress 2.9
PHP5 strongly recommended

Comment E-Mail Verification

Wish it supported embedded html in the verification email. One note. You must have Settings -> Discussion -> Comment must be manually approved checked in order for it to work. Once I figured that out, it works just fine.

Still works

If a comment is held for moderation an email message is sent to the comment author with a link to verify the comment author's email address.

Mailcheck.co

0jekson0

nosovk

Our plugin will be useful to those who are working every day to increase conversion in email mailings and want to decrease bounce rate or accept only real users of all submissions. We will also be useful to those who want to know who is behind that email.
We created a plugin that gives the most accurate data, reachable leads, and which will only accept email addresses from users who have submitted valid emails through any type of form.
At the moment we integrate with: 
* WP-forms 
* ACF 
* Contact Form 7 
* WooCommerce 
* Elementor 
* Mailpoet
You can install and use the plugin by adding an API key, generated from the account <a href="https://www.mailcheck.co" rel="nofollow ugc">free account</a>. 
We aimed to help and make sure you have accurate list of the real users 
<a href="https://www.mailcheck.co/" rel="nofollow ugc">mailcheck</a> feel free to request more integration if needed or contact our support team. 
If you are looking for more detailed information of how to better use the plugin, feel free to check our blog.

MailCheck.co: Validate emails in one click

VALIDATE YOUR MAILING LIST IN ONE CLICK Be confident your mailing list contains only real emails addresses, get rid of bots and inactive users

Comment E-Mail Verification vs MailCheck.co: Validate emails in one click