Hi all, We're running postfix-2.6.6-6.el6_5.x86_64 on RHEL 6.6 and running into a problem where emails that have been released from our outside spam protection company, *.protection.outlook.com, are getting rejected with messages like this:
Mar 26 06:00:56 mailhost postfix/smtpd[2270]: connect from mail-sn1nam01lp0113.outbound.protection.outlook.com[207.46.163.113] Mar 26 06:00:56 mailhost postfix/smtpd[2270]: 51235A07D1: client=mail-sn1nam01lp0113.outbound.protection.outlook.com[207.46.163.113] Mar 26 06:00:56 mailhost postfix/cleanup[2279]: 51235A07D1: message-id=<1490445496218.20153408.25880761.5137938...@backend.ttktravelinsider.com> Mar 26 06:00:56 mailhost postfix/qmgr[27442]: 51235A07D1: from=<ttkpub.nore...@ttktravelinsider.com>, size=40439, nrcpt=1 (queue active) Mar 26 06:00:56 mailhost postfix/local[2278]: 51235A07D1: to=<saba.shar...@sub.com>, relay=local, delay=0.29, delays=0.28/0/0/0.01, dsn=5.4.6, status=bounced (mail forwarding loop for saba.shar...@sub.com) Mar 26 06:00:56 mailhost postfix/bounce[2273]: 51235A07D1: sender non-delivery notification: 97DF2A080B Mar 26 06:00:56 mailhost postfix/qmgr[27442]: 51235A07D1: removed These emails are released by the end user and should be delivered, but are getting bounced back. How would I go about figuring out if it's really a bogus "Delivered-To: " header that's causing this rejection? # postconf -n alias_database = hash:/etc/aliases alias_maps = nis:mail.aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 fallback_transport = html_directory = no inet_interfaces = all inet_protocols = ipv4 local_header_rewrite_clients = static:all local_recipient_maps = mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man masquerade_domains = !hqmta.sub.com $myorigin message_size_limit = 30240000 mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain, sub.com, acs.sub.corp.com mydomain = sub.corp.com myhostname = mailhost.sub.corp.com mynetworks = 127.0.0.0/8, 209.243.0.0/16, 10.0.0.0/8 myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES relay_domains = $mydestination, other.com, otherfoobar.com sample_directory = /usr/share/doc/postfix-2.6.6/samples sender_canonical_maps = hash:/etc/postfix/sender_canonical sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop transport_maps = hash:/etc/postfix/transport_maps unknown_local_recipient_reject_code = 450
