Freemius

franciscus

The Superfast Mailgun add-on for the <a href="https://wordpress.org/plugins/newsletter/" rel="ugc">Newsletter</a> plugin allows you to take full advantage of the Mailgun “Batch Send” API. This makes it possible to send a newsletter to up to 1,000 addresses in a single API call.
For 10,000 subscribers, that’s 10 API calls instead of 10,000 calls. Quite a difference. It will take a lot less time to send out your newsletter.
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Sends newsletters to up to 1,200 subscribers per hour.
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Polls Mailgun for “bounces” and updates your mailing list accordingly.
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Support by email or through the forum on wordpress.org
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Note: 
Filters ‘newsletter_message_html’, ‘newsletter_message_text’, ‘newsletter_message_subject’ and ‘newsletter_message’ are called only once per email, and receive a null $user parameter. This is because Mailgun takes care of replacing user-specific tags in the email. 
Note that the Newsletter plugin has deprecated filters ‘newsletter_message_html’, ‘newsletter_message_text’ and ‘newsletter_message_subject’ in favour of ‘newsletter_message’.When they are removed, this addon will stop using them as well.
<h3>Pro version</h3>
For mailing lists with more than 1,000 subscribers, get the <a href="http://howfrankdidit.com/superfast-newsletters-with-mailgun" rel="nofollow ugc">Pro version</a>!
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Sends up to 120,000 emails / hour
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Integrated Open/Click statistics (Requires the Newsletter Statistics add-on)
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Selectable polling frequency
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Transactional emails (e.g. Welcome email, subscription confirmation) can use a different route, e.g. using a different domain
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Priority email support
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You can easily upgrade from within your WordPress dashboard.

Superfast Mailgun for the Newsletter plugin

A faster Mailgun add-on for The Newsletter Plugin. Very useful if you have a big mailing list.

Christian Ezeani

CYB Mail adds advanced Mail Configuration to your WordPress blog. Use Gmail, Mailgun, and your preferred SMTP server for outgoing mails. You can add as many mail configurations as you want and activate the one you need.
Major features of CYB Mail include:
<ul>
<li>Allows you to add as many mail settings as you want</li>
<li>Allows you to add Gmail, Mailgun and any other SMTP server of your choice</li>
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CYB Mail

CYB Mail adds advanced Mail Configuration to your Wordpress blog. Use Gmail, Mailgun, and your preferred SMTP server for outgoing mails.

Superfast Mailgun for the Newsletter plugin vs CYB Mail