- Plesk 12.5 for Linux
There is a record in the log about authentication from non-existent user (firstname.lastname@example.org):
Apr 18 18:59:01 username postfix/smtpd: B550E84102: client=server.localhost[10.20.30.40], sasl_method=LOGIN, email@example.com
firstname.lastname@example.org is added as an alias to a mailbox other mailbox under domain, e.g.
This email addresses associated with a user's primary (or main) email address.
This is an expected behavior. When an alias
is added to a mailbox
, user can log into this mailbox using both usernames (
) with the password of the original one.
Remove that alias if it is needed. All the content of the mailbox will not be deleted. Additional information could be found in Plesk documentation