However I’m wondering, when is that this file being executed? It appears to not be used anymore.
The outdated Codex data right here:
https://codex.wordpress.org/Post_to_your_blog_using_email
mentions this being deprecated and recommends utilizing plugins as an alternative.
It appears to be the person’s personal accountability to run wp-mail.php to fetch posts from the mailbox, both through hook, calling the file manually through browser or through a cron job. See the Codex hyperlink above for code examples.
This looks like a really gradual deprecation because it nonetheless ships with WordPress core:
https://github.com/WordPress/WordPress/blob/d61b86229736b550457ef7d61563e17c50de9561/wp-mail.php
The ticket to take away it’s right here:
https://core.trac.wordpress.org/ticket/22942
and the outdated dev blogs right here:
