virtab

Email Checker’s Advanced email verification service completes a deep cleaning by performing an SMTP simulation test to check if the mailbox actually exists on the destination mail server for the best email validation accuracy.
Lets face it, people misspell their email address and are completely unaware of it, resulting in a delivery failure due to a bounce or maybe even a spam complaint. Furthermore, you also just lost a potential customer for your business! What is very interesting is most of these invalid email addresses are a result of a simple misspelled domain such as “hotmail.con”, “gnail.com”, or “yahoo.cmo”.
For example “jane@gmail.cmo” perfectly passes the <a href="https://codex.wordpress.org/Function_Reference/is_email" rel="nofollow ugc">is_email()</a> function, but does not really exist. Such addresses cannot escape Email Checker’s email verification test, ensuring you do not lose any valuable leads due to typos, as well as preventing spam signups by bots and more.
Email Checker can verify email addresses by detecting and revising typos, invalid syntax, invalid domain DNS, invalid MX DNS, disposable addresses, role accounts, free email providers, frequent complainers, offensive words, spam traps, honey pots, blacklists, catchalls, greylistings, mailbox exists, mailbox full and mailbox does not exist.
This email validation plugin integrates perfectly with other major plugins such as Contact Form 7, Gravity Forms, Ninja Forms and any other plugins that use the is_email() function. This plugin will validate email addresses in real-time and notify the user immediately so they can change it before submitting.
This plugin requires an Email Checker API Key and for credits to be purchased. You can create an account for Email Checker and purchase credits here: <a href="https://www.emailchecker.io" rel="nofollow ugc">Email Checker</a> (Signup in less than 30 seconds).
NOTE: You must have credits inside your <a href="https://www.emailchecker.io" rel="nofollow ugc">www.emailchecker.io</a> account in order for it to validate email addresses in your website’s forms.

Email Checker

Prevent spam signups by bots and lost customers in comment, registration, and contact forms using Email Checker's Email Verification Plugin.

WebBuddy

Automatic Email Testing for WP is an efficient solution to help you automatically check whether your website’s email sending is working as expected every single day.
Email sending is one of the most fundamental functionalities of your website. When your website is unable to send out emails, contact form enquiries fail to reach you, order emails fail to reach your customers, and the list just goes on.
By using Automatic Email Testing for WP plugin on your website, you will have a smart system that helps you to test your website email server automatically every day, so you can have the assurance that your website’s email sending functionality is working well, day in and out!
The setup process is incredibly quick and simple. All you need is to enter your email address (one-time) and you’re good to go!
The plugin will send the first test email to you immediately once your email address has been saved. Subsequently, it will automatically run tests on your website email server and you should receive a simple email testing report every 24 hours (approx.) if your website email server is working normally.
In the event that you do not receive the daily email testing report on any given day, it means that your website email server is down and you may refer to the plugin settings page for a quick guide on how to troubleshoot the issue.
<h4>FREE VERSION FEATURES INCLUDE:</h4>
<ul>
<li>Automated daily checks on your website email server</li>
<li>Simple email testing report sent to you daily (if email server is working normally only)</li>
<li>Email test record log (for past 3 days)</li>
<li>Ultra-lightweight plugin (will not slow down your website)</li>
<li>Step by step troubleshooting guide available for reference if you do not receive the email testing report</li>
</ul>
If you have any feedback or suggestions to add more features to this plugin, we welcome you to get in touch with us 🙂
Note: This plugin will test whether the email is sent successfully but it does not guarantee the deliverability of emails.
<h4>PRO VERSION</h4>
If you want to be automatically notified even when your email server fails, check out our <a href="https://payhip.com/b/L4KeS" rel="nofollow ugc">PRO version here</a>.
<h4>PRO VERSION FEATURES INCLUDE:</h4>
<ul>
<li>Automated daily checks on your website email server</li>
<li>Simple email testing report sent to you daily (you will be notified even when your email server fails!)</li>
<li>Email test record log (for past 10 days)</li>
<li>Ultra-lightweight plugin (will not slow down your website)</li>
</ul>

Automatic Email Testing for WP

[UPDATED!] Automatic Email Testing for WP plugin allows you to set up a system inside wordpress to test your email server every day.

Email Checker vs Automatic Email Testing for WP