Marco Fioretti: > a) is it possible to tell postfix at example.com that all and only the > email from someuser with a From: address of someu...@someotherdomain.com > should be relayed through that MTA, not directly to destination? (I am > almost sure it is, as I said my first problem is to know/use the right > search > terms for this function, sorry)
Maybe this: http://www.postfix.org/postconf.5.html#sender_dependent_relayhost_maps > b) would it work, as far as SPF and DKIM are concerned? Would it cause > other problems? Does your system have "relay" permissions at the other domain's mail server? You may have to configure SASL auth and "smtp_sender_dependent_authentication = yes". Wietse
