text_combined: noel jones ubdarhmeganvbhcsorg wed feb 13 2008 081749pm 0800 mark anderson wrote server virtual web hosting multiple domains distinct ip address server handle incoming email domains mx records point another isp perform outgoing email web sites lets say domain1org ip1 domain2org ip2 postfix maincf pmyhostname whatevermyispnet alias_maps hashetcaliases alias_database hashetcaliases myorigin etcmailname mydestination whatevermyispnet localhostcorenetworksnet localhost relayhost mynetworks 1270008 mailbox_size_limit 0 recipient_delimiter inet_interfaces see mention virtual domains host everything cool cgi domain1org sends email pvosgprdomain1org everything mostly cool also domain2org sometimes email rejected destination messages like 554 554 relaying denied ip name lookup failed ip1 ip1 actual ip address destination doesnt like fact seeing email domain2org sent ip address domain1org evidence recipient domain requires would stupid rule post log lines showing guilty party exact reject message actual cause likely something else may need contact postmaster recipient domain find requirements question get postfix right thing bind ip2 outgoing email sent domain2org use multiple instances postfix one domain guess might possible set ptr records ip1 list domain1org domain2org domains host seems pretty dubious record ptr record mx record differ domain2org one ptr matching record sending ip sufficient ie 192024 resolves smtpexamplecom smtpexamplecom resolves 192024 thanks guidance mda noel jones tue 05 aug 2008 181716 0600 arrange outgoing email sent correct outgoing ip