justin piszcz wqvmcqblucidpixelscom sat 1 mar 2008 daniel kauffman wrote plans implement sender_dependent_transport_maps similar functionality already exist would like set myhostname smtp_bind_address sender domain would allow mail sender domain originate unique ip address sender domain one benefits one clients ends blacklist none clients affected also setup makes easy track bandwidth usage ip address proposed configuration maincf sender_dependent_transport_maps sender_dependent_transport_mapscf sender_dependent_transport_mapscf sendercom sendertransportnexthop mastercf sendertransport unix n smtp myhostnamesendercom smtp_bind_address0000 pointers existing wheels greatly appreciated thanks daniel kauffman asked solution run 2 instances postfix justin fri 08 aug 2008 014520 0500 sender_dependent_transport_maps