victor duchovni dxdewmdieulnutmorganstanleycom fri mar 07 2008 123557am 0600 maierchris wrote couple postfix smart hosts postfix 243 handle internal external relaying local mailboxes smart hosts companies nix systems either sendmail submit configured use postfix smart hosts next hop means helo commands look like serveronehebcom addresses like bsefnserveronehebcom smart hosts domain masquerading hebcom rewrite works exactly expected email successfully delivered case anywhere messages deliverable due bad addresses etc host names ips masked based emailhost information get address rewritten prior generating ndr instead trying return message email address bsefnserveronehebcom serveronehebcom host ndr message instead rerouted delivered bsefnhebcom real mailbox exists sample log entry feb 6 065950 relayserver postfixsmtpd29026 noqueue reject rcpt serveronehebcom1011217 450 412 recipient address rejected domain found protoesmtp helo cant rewrite message reject remote server submitting ndr viktor disclaimer offlist followups get onlist replies get ignored please ignore replyto header unsubscribe postfixusers list visit httpwwwpostfixorglistshtml click link response solves problem best way thank send worked thanks followup must respond please put worked thanks subject delete quickly fri 08 aug 2008 085714 0500 address rewrite ndr