Hey there,

I saw this post online:

Instructions

Create the test-email.php script with the following:

<?php 
    ini_set( 'display_errors', 1 );
    error_reporting( E_ALL );
    $from = "emailtest@YOURDOMAIN";
    $to = "YOUREMAILADDRESS";
    $subject = "PHP Mail Test script";
    $message = "This is a test to check the PHP Mail functionality";
    $headers = "From:" . $from;
    mail($to,$subject,$message, $headers);
    echo "Test email sent";
?>

If you have a Virtual Private Server (VPS), login to the server to execute:
php test-email.php
Alternatively, place the file in your httpdocs directory so that it can be called from your website.
Check your email to ensure it has been delivered.
If you have the file publically accessible on your website, don’t forget to delete it after testing is complete!

if you get an error regarding your /etc/postfix/main.cfm which I received, then run:

sudo dpkg-reconfigure postfix

follow the default value, or change it depending on your server settings. Running php test-email.php again, resulted in mail being sent out on my end. which is great.

However, I disabled SMTP, and resulted back to PHP mail but no dice :-(