I have several ubuntu servers / desktops running on the same machine using kvm (under ubuntu server 12.04)
With postfix on each virtual machine I've redirected each root's mail to my gmail account.
Everything works fine,
The problem comes that some daemons send notifications without identifying the machine name. So, when I get the email, I dont know which virtual machine has sent it.
Is there any way with postfix conf to add a custom text like "asterisk_server:" before the subject, to identify the comoputer from the email has been sent?