Sends email from WordPress via Mailgun service, that’s all, does it well.

Mailgun is an email delivery service aimed at sending transactional email for software developers. If you are not already using Mailgun to send email, then you don’t need or want this plugin. If you do use the Mailgun service, this plugin makes it easy to configure WordPress to send through your existing Mailgun domains. That’s the only reason for it. It does that quite well.

Many of the negative reviews seem to be for some other plugin, as they refer to functions that this plugin does not provide such as web forms, email delivery logs, validation, etc. Ignore such reviews, they’re simply irrelevant.

One star taken off for being slow to update, but it’s not a deal-breaker.