//Follow-up to {T388022}//
Prior to T388022 being resolved, the Phabricator test-instance at https://phabricator.wikimedia.org couldn't send any emails at all (I believe), due to attempting to send them from a subdomain of `.wmcloud.org` that hadn't been configured for sending email (xref T388022#11233132).
Now, the test Phabricator instance can send at-least //some// email (addressed from `phabricator-no-reply@wmcloud.org`), but two separate individuals with email addresses ending in `@wikimedia.org` have confirmed that account-confirmation emails from the test-instance don't seem to be arriving in those email accounts (Dzahn in T388022#11783879, & Raine [[https://wm-bot.wmcloud.org/browser/index.php?start=04%2F07%2F2026&end=04%2F07%2F2026&display=%23wikimedia-tech#:~:text=A_smart_kitten%3A%20I%20tried%20to%20create%20an%20account%20and%20indeed%20don%27t%20seem%20to%20have%20the%20email|in #wikimedia-tech]]).
This task is to figure out why this is happening, and to try and fix it :D