I upgraded to 1.16.2 and deletion works for other users but not for 2 that tried to delete their own accounts.
One of them wants the account to be deleted, the other one wants it to be restored. How do I deal with those cases?
Some deeper DNS/MX work seems to have made the difference and using "encrypted" setting - initially I was using StartTLS as per email provider SMTP guide, which specified TLS - tested it again and StartTLS broke it.