Bogdan Kushlyk

SX Easy-going SMTP is a free plugin for setting up sending emails for any WordPress web site.
Guide on how to use this plugin:
First of all install the plugin as described in “Installation”. 
After that new menu item “Settings -> SX Easy-going SMTP” will be added to admin settings menu.
For setting up third party mailing service like AWS SES, Google, Postmark or any other open the 
page Settings -> SX Easy-going SMTP and enter given credentials like host, port, username, password.

SX Easy-going SMTP

SX Easy-going SMTP is FREE plugin for sending e-mail from a wordpress web-site. Allows easily set up e-mail sending on any wordpress site in minutes.

Juergen Schulze

A plugin for wordpress which allows you to send an email to the registered blog users. Users can send personal emails to each other. Power users can email groups of users and even notify group of users of posts.
With ability to schedule mails of the newest post in digest form.
! ! ! S T I L L B E T A ! ! !
All the instructions for installation, the support forums, a FAQ, etc. can be found on the <a href="http://1manfactory.com/emu2" rel="nofollow ugc">plugin home page</a>.
This plugin is available under the GPL license, which means that it’s free. But a “thank you” on my blog is highly apprechiated.
Check out my other <a href="https://wordpress.org/extend/plugins/profile/1manfactory" rel="ugc">WordPress Plugins</a>
<h3>Remove plugin</h3>
<ol>
<li>Deactivate plugin through the ‘Plugins’ menu in WordPress</li>
<li>Delete plugin through the ‘Plugins’ menu in WordPress</li>
</ol>
It’s best to use the build in delete function of wordpress. That way all the stored data will be removed and no orphaned data will stay.
<h3>To do</h3>
More translations. Does someone wants to help?

Emu2 – Email Users 2

Send email to users, manually or on schedule (digest of newest posts).  Users can send emails to each other. Export function included. STILL BETA!!!

SX Easy-going SMTP vs Emu2 – Email Users 2