text_combined: maierchris dmeuctpvnlhebcom 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 maillog4feb 6 065950 relayserver postfixsmtpd29026 noqueue reject rcpt serveronehebcom1011217 450 412 recipient address rejected domain found protoesmtp helo postconf n alias_database hashetcpostfixaliases alias_maps hashetcpostfixaliases append_at_myorigin yes append_dot_mydomain yes command_directory usrsbin config_directory etcpostfix daemon_directory usrlibexecpostfix debug_peer_level 2 delay_warning_time 4h disable_vrfy_command yes empty_address_recipient mailerdaemon html_directory usrsharedocpostfix243documentationhtml inet_interfaces 1011159 local_header_rewrite_clients permit_mynetworks local_recipient_maps local_transport errorlocal email delivery disabled relay mail_owner postfix mailq_path usrbinmailqpostfix manpage_directory usrshareman masquerade_classes envelope_sender header_sender header_recipient envelope_recipient masquerade_domains hebcom mydestination mydomain hebcom myhostname relayserver mynetworks 100008 myorigin mydomain newaliases_path usrbinnewaliasespostfix queue_directory varspoolpostfix readme_directory usrsharedocpostfix243documentationreadme relay_domains hashetcpostfixrelay_domainsconf relayhost hosthebcom sample_directory etcpostfix sendmail_path usrsbinsendmailpostfix setgid_group postdrop smtp_fallback_relay host3hebcom host2hebcom smtp_helo_timeout 180s smtp_mail_timeout 180s smtp_quit_timeout 180s smtp_rcpt_timeout 180s smtpd_banner myhostname esmtp mail_name smtpd_helo_required yes smtpd_helo_restrictions reject_invalid_hostname reject_non_fqdn_hostname reject_unknown_hostname smtpd_recipient_restrictions reject_non_fqdn_recipient reject_unknown_recipient_domain reject_unauth_destination reject_non_fqdn_hostname reject_invalid_hostname transport_maps hashetcpostfixtransport unknown_local_recipient_reject_code 550 virtual_alias_maps hashetcpostfixvirtual thank advance chris fri 08 aug 2008 070945 0600 address rewrite ndr