PhilHilton

This plugin is not affiliated with WP Forms, makers of the WP Mail SMTP plugin. Please do not bother them with support requests. It is a 3rd party solution to the lack of logging in the free version of their product.
Please bear in mind that future updates to WP Mail SMTP may break this plugin’s ability to log messages, and it may take some time for an update to be released. If they go out of their way to remove the WordPress Action Hook it depends on then an update may not be possible at all. Please use this plugin at your own risk.
This plugin has only been tested with the SMTP configuration, and not any of the other implementations provided by WP Mail SMTP. If you use it with another configuration I would be interested in hearing about you experience so that I can either confirm here that it works or make changes so that it will.

Logger for WP Mail SMTP (3rd Party)

This plugin is not affiliated with WP Forms, makers of the WP Mail SMTP plugin. Please do not bother them with support requests.

chandima

Display log messages from PHP in the browser console in Safari, Firefox (with firebug), and Opera (with the new Dragonfly debugging environment). Essential debugging tool for 
plugin and theme developers. You no longer have to use ‘print_r’ statements from PHP to figure out what is going 
on in the code, which more often than not, messes up the DOM and HTML layout. Displays complex PHP structures like arrays and objects 
in pretty print.
Features
<ul>
<li>Log debug messages directly from themes and plugins.</li>
<li>Display log messages in the browser console, without muddying up the browser display.</li>
<li>Displays complex structures such as arrays and objects in pretty print.</li>
<li>Shows the line number and file from where the message was logged ( you won’t lose track of log statements ).</li>
</ul>
For more info, comments, and feature requests, visit <a href="http://www.turingtarpit.com/2009/05/wplogger" title="Wordpress Logger" rel="nofollow ugc">the plugin homepage</a>.
<h3>Credits</h3>
Code that forces the wplogger plugin to load first was adapted from the WordPress 
<a href="http://inchoo.net/wordpress/wordpress-firephp-plugin/" title="FirePHP plugin" rel="nofollow ugc">FirePHP plugin</a> 
developed by Ivan Weiller.
This plugin is based on <a href="http://pear.php.net/package/Log" title="PEAR Log" rel="nofollow ugc">PEAR Log</a>, the logging framework that is part of the 
PHP PEAR library. Current maintainers Jon Parise, Jan Schneider, and Chuck Hagenbuch. PEAR Log is based on code first 
developed for the Horde 1.3 framework – original authors Chuck Hagenbuch, and Jon Parise.
<h3>Release Notes</h3>
0.3 : Added support for Opera ;
0.2.2 : Fixed formatting issues in readme.txt file;
0.2.1 : Added more detail to the readme.txt file;
0.2 : First official public release;
0.1 : First internal release;

WordPress Logger

Display log messages during plugin and theme development on the console in Safari and Firefox (with Firebug) browsers.

Logger for WP Mail SMTP (3rd Party) vs WordPress Logger