Hi Wietse! indeed, judging from this howto I found thanks to your pointer:
http://kostja-osipov.livejournal.com/32518.html *sender_dependent_relayhost_maps *seems exactly what I need, > Does your system have "relay" permissions at the other domain's mai > server? You may have to configure SASL auth and > "smtp_sender_dependent_authentication = yes". that's likely the next step, now I know where to go, thanks. Marco
