The suggested message/subject described in https://github.com/matomo-org/matomo/issues/14455 (linked in #14302) is a bit different than what's in this PR, can that be changed? Also it mentions sending an HTML email so Maill::setWrappedHtmlBody() would need to be used.
Thanks @diosmosis, have updated with the content suggested on #14455
Would be great to have more debug information but I don't know how that's possible. Merging for now :+1:
fyi Documented in: Emails from Matomo are not being sent, how do I troubleshoot and solve the issue?