Congrats Balkhi!

As a proof of concept, I created a tiny plugin years ago that overloads the `wp_mail()` function in `pluggable.php`. It takes its configuration from `wp-config.php` settings, as I didn’t want my SMTP credentials to be stored in the MySQL database wp_options table (that was the proof of concept).

Here’s the write-up and link to my WordPress enhancement proposal on Trac: