Hi, I have 10 vps on virtualmin i got same issue i check hostname domain name in main.cf postfix check /etc/postfix/virtual virtual alias already exists in /etc/postfix/virtual hostmaster,postmaster,abuse i can able to recive email under my postmaster email account can any body tell me what to do i have search every thing on google and do it but same issue i face again and again its in all 10 vps not only one vps.
This is the mail system at host host.securemailsender.info.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<email@example.com> (expanded from
<firstname.lastname@example.org>): User unknown in virtual alias table
Regards Fraz Ali Server Admin Goldbartech