Normally I am not watching the logs within this eFa solution closely, but I had to unblock a domain for SMTP. As I was testing to make sure the domain can send email, I noticed the following error:
Jul 11 19:05:28 mx MailScanner[724120]: Unable to initialise database connection: Access denied for user 'efa'@'localhost' (using password: NO)
Is Mail Scanner trying to send some report to a local account via an alias?
The installation never defined any account (user or system account) defined as efa.
Watching what was used within the /etc/aliases file efa is not listed. (I added efa and mapped to a email address.)
But I was not sure how efa@localhost was being defined/used within mailscanner.
Look forward to any knowledge that any can share.
--recent edit -----
I did notice these longs within the web GUI: https://mx.mydnshq.email/mailscanner/msconfig.php
Notices From EFA
Notices To postmaster
Local Postmaster postmaster