After making a huge change to AB at the end of April, I have not done any work on AB just in case something needed to be rolled back. It has been nearly a month so I am pretty sure we can use that version as the newest WORKING version.
11:04 Wednesday 27 May 2020 JST
Yay! I was able to wipe our copy-pasted installation of PHPMailer in favor of having it installed by Composer. I had tried this before, but had errors because I also needed to add a line to autoload Composer’s classes.
require __DIR__ . "/vendor/autoload.php";
Now with that line, composer-installed classes can be found. This should let me fix another ticket for a different composer class that wasn’t working before.