Hi it seems to be a layer 3 issue, according to the description I will check any firewall or router at the perimeters end.
Have you checked that? Have you tried tcpdump to check if those packets are leaving the box? Thats just a thought, I hope it helps. Regards. Saludos Ing. Alfonso Alejandro Reyes Jimenez Coordinador de Seguridad - SASI E-mail: aare...@scitum.com.mx Telefono: 91507489 Movil: (044) 55 85 81 04 62 De: Gonzo Fernandez [mailto:go...@usaepay.com] Enviado: Monday, January 30, 2012 06:46 PM Para: postfix users <postfix-users@postfix.org> Asunto: Re: Mail stuck (Connection Timed-Out) Thank you Noel. Our server sends out copies of email confirmations to our clients and if the client decides to make a large order they end up pushing our volume up and we end up getting blocked by their mail server. I seem to be getting connection timed out on a lot of the hosts. I even try to telnet to ip and port 25 but it keeps timing out. I used "grep" to search in /var/log/maillog and I got this. Any ideas? [root@mx-server ~]# cat /var/log/maillog | grep B0847E8491 Jan 30 08:44:38 mx-server postfix/cleanup[24478]: B0847E8491: message-id=<20120130164438.B0847E8491@mxser...@example.com> Jan 30 08:44:38 mx-server postfix/qmgr[16186]: B0847E8491: from=<>, size=3456, nrcpt=1 (queue active) Jan 30 08:44:38 mx-server postfix/bounce[24473]: 2604BE84D6: sender non-delivery notification: B0847E8491 Jan 30 08:45:01 mx-server postfix/smtp[24278]: B0847E8491: to=<m...@example.com>, relay=none, delay=23, delays=0.03/0/23/0, dsn=4.4.1, status=deferred (connect to example.com[1.2.3.4]: Connection timed out) Jan 30 09:08:09 mx-server postfix/qmgr[16186]: B0847E8491: from=<>, size=3456, nrcpt=1 (queue active) Jan 30 09:08:32 mx-server postfix/smtp[24522]: B0847E8491: to=<m...@example.com>, relay=none, delay=1434, delays=1411/0/23/0, dsn=4.4.1, status=deferred (connect to example.com[1.2.3.4]: Connection timed out) Jan 30 09:41:31 mx-server postfix/qmgr[16186]: B0847E8491: from=<>, size=3456, nrcpt=1 (queue active) Jan 30 09:41:52 mx-server postfix/smtp[24793]: B0847E8491: to=<m...@example.com>, relay=none, delay=3434, delays=3412/0.1/21/0, dsn=4.4.1, status=deferred (connect to example.com[1.2.3.4]: Connection timed out) Jan 30 10:48:09 mx-server postfix/qmgr[16186]: B0847E8491: from=<>, size=3456, nrcpt=1 (queue active) Jan 30 10:48:15 mx-server postfix/smtp[25097]: B0847E8491: to=<m...@example.com>, relay=none, delay=7417, delays=7411/0.06/5.9/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=example.com type=A: Host not found, try again) Jan 30 12:11:30 mx-server postfix/qmgr[16186]: B0847E8491: from=<>, size=3456, nrcpt=1 (queue active) Jan 30 12:11:53 mx-server postfix/smtp[25539]: B0847E8491: to=<m...@example.com>, relay=none, delay=12435, delays=12411/0.05/23/0, dsn=4.4.1, status=deferred (connect to example.com[1.2.3.4]: Connection timed out) Jan 30 13:22:45 mx-server postfix/qmgr[26236]: B0847E8491: from=<>, size=3456, nrcpt=1 (queue active) Jan 30 13:23:12 mx-server postfix/smtp[26261]: B0847E8491: to=<m...@example.com>, relay=none, delay=16713, delays=16687/0.56/26/0, dsn=4.4.1, status=deferred (connect to example.com[1.2.3.4]: Connection timed out) Jan 30 13:53:27 mx-server postfix/qmgr[26443]: B0847E8491: from=<>, size=3456, nrcpt=1 (queue active) Jan 30 13:53:55 mx-server postfix/smtp[26593]: B0847E8491: to=<m...@example.com>, relay=none, delay=18556, delays=18529/6.5/21/0, dsn=4.4.1, status=deferred (connect to example.com[1.2.3.4]: Connection timed out) Jan 30 15:14:54 mx-server postfix/qmgr[27600]: B0847E8491: from=<>, size=3456, nrcpt=1 (queue active) Jan 30 15:15:21 mx-server postfix/smtp[27790]: B0847E8491: to=<m...@example.com>, relay=none, delay=23443, delays=23416/5.9/21/0, dsn=4.4.1, status=deferred (connect to example.com[1.2.3.4]: Connection timed out) [root@mx-server ~]# telnet 1.2.3.4 25 Trying 1.2.3.4... telnet: connect to address 1.2.3.4: Connection timed out telnet: Unable to connect to remote host: Connection timed out Gonzo Fernandez On Jan 30, 2012, at 3:36 PM, Noel Jones wrote: On 1/30/2012 5:07 PM, Gonzo Fernandez wrote: Hi All, My relay servers have mail being received but unable to send. When I type "mailq" I see: Delivery temporarily suspended….Connection timed out. I also noticed this line: Tarpitting active for [1.2.3.4) I restarted postfix, flushed mailq and still everything is stuck. Now the mail is building up and I don't know what else to do. I'm still continuing to work on it but I figure I might as well ask the postfix team members. Can anyone help me figure this thing out please? mailq: Jan 30 13:53:27 mx-server postfix/qmgr[26443]: BC535E8264: from=<m...@example.com <mailto:m...@example.com>>, size=805, nrcpt=1 (queue active) Jan 30 13:53:55 mx-server postfix/qmgr[26443]: BC535E8264: to=<m...@example.com <mailto:m...@example.com>>, relay=none, delay=357647, delays=357619/28/0/0, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to example.com <http://example.com>[1.2.3.4]: Connection timed out) (please post in plain-text only) (please use example.com rather than real domain names. thanks) Looks as if the destination 1.2.3.4 doesn't like your server. You'll need to check with them about why. One possibility is that you've been flooding them with backscatter and they've blacklisted you for that. If that's the problem, the solution is to not accept mail you can't deliver. Or maybe you've got a spam-bot on your network that's spewing stuff they don't like. But that's just speculation... Only they know the reason. -- Noel Jones
