BaiatuLuTata

This plugin overrides the default WordPress email sending function with MailGuns’s Mail Send API.
Key Features:
<ul>
<li>Toggle Email Override for Mailgun on/off</li>
<li>Enter your Mailgun API key and domain</li>
<li>Customize the “From” email and name</li>
<li>Send a test email directly from the settings page</li>
<li>Clean and native WordPress admin UI</li>
</ul>
<h3>External Services</h3>
This plugin integrates with the <a href="https://www.mailgun.com/" rel="nofollow ugc">Mailgun</a> email delivery service to send outgoing emails via its API instead of the default <code>wp_mail()</code> function.
When enabled, the plugin communicates with the following Mailgun API endpoint: https://api.mailgun.net/v3/YOUR_DOMAIN/messages
Data sent to Mailgun includes: 
– Sender name and email 
– Recipient email(s) 
– Email subject 
– Message body (text or HTML) 
– Optional headers (Cc, Bcc)
The plugin requires a valid Mailgun API key and domain to function. These credentials are stored in your WordPress database and used only to authenticate API requests to Mailgun.
Privacy Notice: 
By using this plugin, you agree to Mailgun’s <a href="https://www.mailgun.com/terms/" rel="nofollow ugc">Terms of Service</a> and <a href="https://www.mailgun.com/privacy-policy/" rel="nofollow ugc">Privacy Policy</a>. Ensure your use of Mailgun complies with local privacy laws and your own data protection policies.

Email Override for Mailgun

Replaces WordPress wp_mail() with MailGun's API. Adds a settings page to manage API key, sender info, and test email functionality.

EverPress

Xaver

Mailster Newsletter Plugin

<blockquote>
This Plugin requires <a href="https://mailster.co/?utm_campaign=wporg&utm_source=wordpress.org&utm_medium=readme&utm_term=Mailgun" rel="nofollow ugc">Mailster Newsletter Plugin for WordPress</a>
</blockquote>
Uses Mailgun to deliver emails for the <a href="https://mailster.co/?utm_campaign=wporg&utm_source=wordpress.org&utm_medium=readme&utm_term=Mailgun" rel="nofollow ugc">Mailster Newsletter Plugin for WordPress</a>.
Read the <a href="https://kb.mailster.co/send-your-newsletters-via-mailgun?utm_campaign=wporg&utm_source=Mailgun&utm_medium=readme" rel="nofollow ugc">Setup Guide</a> to get started.
<h3>Additional Info</h3>
This Plugin requires <a href="https://mailster.co/?utm_campaign=wporg&utm_source=wordpress.org&utm_medium=readme&utm_term=Mailgun" rel="nofollow ugc">Mailster Newsletter Plugin for WordPress</a>

Mailster Mailgun Integration

Uses Mailgun to deliver emails for the Mailster Newsletter Plugin for WordPress.

Email Override for Mailgun vs Mailster Mailgun Integration