FolioVision

This plugin reconfigures the wp_mail() function to use SMTP instead of mail() and creates an options page that allows you to specify various options.
You can set the following options:
<ul>
<li>Specify the from name and email address for outgoing email.</li>
<li>Choose to send mail by SMTP or PHP’s mail() function.</li>
<li>Specify an SMTP host (defaults to localhost).</li>
<li>Specify an SMTP port (defaults to 25).</li>
<li>Choose SSL / TLS encryption (not the same as STARTTLS).</li>
<li>Choose to use SMTP authentication or not (defaults to not).</li>
<li>Specify an SMTP username and password.</li>
</ul>
Also adds subject to headers for SendGrid Activity Screen. SengGrid is a powerful SMTP service, however it’s Activity Log screen misses the message subjects. Our plugin adds that back in!

WP Mail SMTP SendGrid Edition

Based on WP Mail SMTP. Also adds subject for display on SendGrid Activity Screen.

David Cramer

Caldera SMTP Mailer is not groundbreaking in any way. There are many SMTP plugins around some good some not so good. This is just to take away all the mystery with a to-the-point solution for configuring wp_mail ( and in turn phpmailer ) to send through SMTP over standard phpmail.

Caldera SMTP Mailer

Just what I needed to test on my local machine where php_mailer fails

WP Mail SMTP SendGrid Edition vs Caldera SMTP Mailer