It looks like the upstream relay (9.8.7.6) is trying to contact the client. Does Postfix need DNS to resolve mail to be forwarded?
#### Apr 29 15:37:26 client sendmail[15767]: s3TJbQGQ015767: from=root, size=47, class=0, nrcpts=1, msgid=<201404291937.s3tjbqgq015...@client.example.com> , relay=root@localhost Apr 29 15:37:26 client sendmail[15767]: s3TJbQGQ015767: from=root, size=47, class=0, nrcpts=1, msgid=<201404291937.s3tjbqgq015...@client.example.com> , relay=root@localhost Apr 29 15:37:26 client sendmail[15767]: s3TJbQGQ015767: to=l...@example.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=3 0047, relay=2.3.4.5, dsn=5.1.2, stat=Host unknown (Name server: 2.3.4.5: host not found) Apr 29 15:37:26 client sendmail[15767]: s3TJbQGQ015767: to=l...@example.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=3 0047, relay=2.3.4.5, dsn=5.1.2, stat=Host unknown (Name server: 2.3.4.5: host not found) Apr 29 15:37:26 client sendmail[15767]: s3TJbQGQ015767: s3TJbQGR015767: DSN: Host unknown (Name server: 2.3.4.5: host not found) Apr 29 15:37:26 client sendmail[15767]: s3TJbQGQ015767: s3TJbQGR015767: DSN: Host unknown (Name server: 2.3.4.5: host not found) Apr 29 15:37:26 client postfix/smtpd[15771]: connect from localhost.localdomain[127.0.0.1] Apr 29 15:37:26 client postfix/smtpd[15771]: connect from localhost.localdomain[127.0.0.1] Apr 29 15:37:26 client postfix/smtpd[15771]: E7506300039: client=localhost.localdomain[127.0.0.1] Apr 29 15:37:26 client postfix/smtpd[15771]: E7506300039: client=localhost.localdomain[127.0.0.1] Apr 29 15:37:26 client postfix/cleanup[15773]: E7506300039: message-id=<201404291937.s3tjbqgr015...@client.example.com> Apr 29 15:37:26 client postfix/cleanup[15773]: E7506300039: message-id=<201404291937.s3tjbqgr015...@client.example.com> Apr 29 15:37:27 client postfix/qmgr[8727]: E7506300039: from=<>, size=2255, nrcpt=1 (queue active) Apr 29 15:37:27 client postfix/qmgr[8727]: E7506300039: from=<>, size=2255, nrcpt=1 (queue active) Apr 29 15:37:27 client sendmail[15767]: s3TJbQGR015767: to=root, delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=31071, relay=[127.0.0.1] [127.0.0 .1], dsn=2.0.0, stat=Sent (Ok: queued as E7506300039) Apr 29 15:37:27 client sendmail[15767]: s3TJbQGR015767: to=root, delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=31071, relay=[127.0.0.1] [127.0.0 .1], dsn=2.0.0, stat=Sent (Ok: queued as E7506300039) Apr 29 15:37:27 client postfix/smtpd[15771]: disconnect from localhost.localdomain[127.0.0.1] Apr 29 15:37:27 client postfix/smtpd[15771]: disconnect from localhost.localdomain[127.0.0.1] Apr 29 15:37:27 client postfix/smtp[15774]: E7506300039: to=<r...@client.example.com>, relay=2.3.4.5[2.3.4.5]:25, delay=0.19, delays=0.07/0.01/0.02/0 .08, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 36D5B1E02AE) Apr 29 15:37:27 client postfix/smtp[15774]: E7506300039: to=<r...@client.example.com>, relay=2.3.4.5[2.3.4.5]:25, delay=0.19, delays=0.07/0.01/0.02/0 .08, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 36D5B1E02AE) Apr 29 15:37:27 client postfix/qmgr[8727]: E7506300039: removed Apr 29 15:37:27 client postfix/qmgr[8727]: E7506300039: removed Apr 29 15:37:27 client postfix/smtpd[15771]: connect from unknown[9.8.7.6] Apr 29 15:37:27 client postfix/smtpd[15771]: connect from unknown[9.8.7.6] Apr 29 15:37:27 client postfix/smtpd[15771]: 33862300039: client=unknown[9.8.7.6] Apr 29 15:37:27 client postfix/smtpd[15771]: 33862300039: client=unknown[9.8.7.6] Apr 29 15:37:27 client postfix/cleanup[15773]: 33862300039: message-id=<201404291937.s3tjbqgr015...@client.example.com> Apr 29 15:37:27 client postfix/cleanup[15773]: 33862300039: message-id=<201404291937.s3tjbqgr015...@client.example.com> Apr 29 15:37:27 client postfix/smtpd[15771]: disconnect from unknown[9.8.7.6] Apr 29 15:37:27 client postfix/smtpd[15771]: disconnect from unknown[9.8.7.6] On Tue, Apr 29, 2014 at 1:21 PM, Wietse Venema <wie...@porcupine.org> wrote: > leam hall: >> > As root on my new relayhost I can send mail to m...@example.com. Mail >> > goes through another relay and then hits our system. Using Postfix >> > 2.6.6. on RHEL 6. >> > >> > I have configured a client to send mail through the new relayhost. The >> > mail gets to the relayhost's maillog with about 16 connect/disconnects >> > and stanzas like >> > >> > connect from unknown[3.4.5.6] >> > client=unknown[3.4.5.6] >> > from=<>, size=11652, nrcpt=1 (queue active) > > The client [3.4.5.6] is reporting a mail delivery error. > >> What I don't get is why the from is blank and the to is root@relayhost > > That's because the client [3.4.5.6] is reporting a mail delivery > error. > > To find out why the client [3.4.5.6] reports a delivery error, look > in the mail logfile on the client. > > Wietse -- Mind on a Mission
