Sirius Pro

Simply configure your SMTP server and send email directly from WordPress site. This plugin allows you to easily send email through SMTP server and phpmailer without modifying the code and it works with most of the available themes. Just install and activate this plugin to use SMTP server and send emails in WordPress.
Read more about this plugin on <a href="https://siriuspro.pl" rel="nofollow ugc">WordPress</a> blog.

Mail SMTP

Simply configure your SMTP server and send email directly from WordPress site.

Em Shreve

This plugin implements gzip output compression to speed up load times.
The plugin also does a check to see if browsers are incorrectly saying that they do not support GZIP when they actually do. This can speed up load times for a significant portion of users.
<pre><code>For requests with missing or mangled Accept-Encoding headers, inspect the User-Agent to identify browsers that should understand gzip.
* Test their ability to decompress gzip.
* If successful, send them gzipped content!
</code></pre>
See:
<ul>
<li>http://www.stevesouders.com/blog/2010/07/12/velocity-forcing-gzip-compression/</li>
<li>http://en.oreilly.com/velocity2010/public/schedule/detail/14334</li>
<li>http://wpdevel.wordpress.com/2010/07/13/forcing-gzip-httpwww-stevesouders-co/</li>
</ul>

Force gzip

Implements gzip output compression to speed up load times and does a check to see if browsers are incorrectly saying that they do not support GZIP whe …

Mail SMTP vs Force gzip