I'm looking for a way to define multiple hostnames - a specific hostname for each domain I'm running. That means for example I have configured mail domains and mails accounts for domain1.com, domain2.com and domain3.com. Right now, all mails will be sent with the fqdn of the mailserver. In this case its server.domain1.com. But I don't want to handle it this way. If mails will be sent from a domain2.com account, the hostname which will be sent should be server.domain2.com. Also in case of a mail from domain3.com, the hostname which will be sent should be server.domain3.com. Is this possible and how can this be achieved?