Hi,
first of all thanks for creating and sharing this really useful plugin.
One thing that troubled me was that the debug output styling was always green ("the CSS class = .updated" was used) even if the test mail was unsuccessful.
So I went on and added a couple of lines to change the debug output class to .error whenever the test email failed:
FILE: wp_mail_smtp.php
Line#207 Added just after:$smtp_debug = ob_get_clean();
// CHECK IF AN ERROR OCCURED AND DISPLAY OUTPUT USING .error CLASS
$notificationClass = ( $phpmailer->ErrorInfo === "" ) ? "updated" : "error" ;And replaced:
<div id="message" class="updated fade"><p><strong><?php _e('Test Message Sent', 'wp_mail_smtp'); ?></strong></p>
with this:
<div id="message" class="<?php echo $notificationClass; ?> fade"><p><strong><?php _e('Test Message Sent', 'wp_mail_smtp'); ?></strong></p>
Now, whenever an error occurs, the debug output is displayed in red, signifying an error when sending test mail. Otherwise, the green output -we all love and worship- is being displayed.
I hope this helps some people out there when debugging connectivity issues.
Once again, thanks for the plugin!