What Is Causing This Failure
I am getting a report from someone on my network that they are getting delivery failures when attempting to send an email from my Postfix server to the remote mail server. I see the message stuck on my Postfix servers queue: CB87E778055 1337 Mon Nov 30 08:59:15 tprem...@iamghost.com (connect to a.mx.premore.net[198.186.193.20]: No route to host) b...@premore.net I am guessing that this is a problem with the remote mail server 'a.mx.premore.net' since my server is sending and receiving email just fine to every other destination. I then decided to do a MX lookup for this domain premore.net see if there is anything wrong: ;; QUESTION SECTION: ;premore.net. IN MX ;; ANSWER SECTION: premore.net.3093IN MX 0 a.mx.premore.net. ;; ADDITIONAL SECTION: a.mx.premore.net. 3093IN A 198.186.193.20 However my mail server wont send to this destination address and I have no idea why. Can someone tell me how I can better examine this situation to understand where the fault lies. Thank you!
Re: What Is Causing This Failure
Carlos Williams wrote: CB87E778055 1337 Mon Nov 30 08:59:15 tprem...@iamghost.com (connect to a.mx.premore.net[198.186.193.20]: No route to host) However my mail server wont send to this destination address and I have no idea why. Can someone tell me how I can better examine this situation to understand where the fault lies. Well, check your internet connectivity. No route to host means that server cannot connect to other end. (you can test using telnet ip.address 25) Usually netmask/gateway or firewall is poorly configured or your isp is blocking direct smtp connections without smarthost. -- Eero
Re: What Is Causing This Failure
On Tue, Dec 01, 2009 at 10:03:21AM -0500, Carlos Williams wrote: CB87E778055 1337 Mon Nov 30 08:59:15 tprem...@iamghost.com (connect to a.mx.premore.net[198.186.193.20]: No route to host) b...@premore.net Looks like more of a network issue and not postfix specific. Try to telnet to the remote host and see if you can connect (run a tcpdump at the same time to see whats happening). Try simple network diagnostics (ie. ping, traceroute etc ...). /erol
Re: What Is Causing This Failure
On Tue, 2009-12-01 at 10:03 -0500, Carlos Williams wrote: I am getting a report from someone on my network that they are getting delivery failures when attempting to send an email from my Postfix server to the remote mail server. I see the message stuck on my Postfix servers queue: CB87E778055 1337 Mon Nov 30 08:59:15 tprem...@iamghost.com (connect to a.mx.premore.net[198.186.193.20]: No route to host) b...@premore.net This is a network issue and not a postfix issue. Try connecting to a.mx.premore.net using telnet on port 25. Check your routing tables to find out why a network connection to that host is not possible. I am guessing that this is a problem with the remote mail server 'a.mx.premore.net' since my server is sending and receiving email just fine to every other destination. I then decided to do a MX lookup for this domain premore.net see if there is anything wrong: ;; QUESTION SECTION: ;premore.net. IN MX ;; ANSWER SECTION: premore.net. 3093IN MX 0 a.mx.premore.net. ;; ADDITIONAL SECTION: a.mx.premore.net. 3093IN A 198.186.193.20 However my mail server wont send to this destination address and I have no idea why. Can someone tell me how I can better examine this situation to understand where the fault lies. Thank you! -- Martijn de Munnik mart...@youngguns.nl YoungGuns
Re: What Is Causing This Failure
* Carlos Williams carlosw...@gmail.com: I am getting a report from someone on my network that they are getting delivery failures when attempting to send an email from my Postfix server to the remote mail server. I see the message stuck on my Postfix servers queue: CB87E778055 1337 Mon Nov 30 08:59:15 tprem...@iamghost.com (connect to a.mx.premore.net[198.186.193.20]: No route to host) b...@premore.net Works OK. What does tracroute 198.186.193.20 return? # traceroute 198.186.193.20 traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 60 byte packets ... snip ... 4 zr-pot1-te0-0-0-3.x-win.dfn.de (188.1.144.30) 5.288 ms 5.290 ms 5.281 ms 5 cr02.frf02.pccwbtn.net (80.81.192.50) 18.030 ms 18.027 ms 18.132 ms 6 carpathia.ge12-1.br02.ash01.pccwbtn.net (63.218.94.166) 109.111 ms 106.313 ms 106.528 ms 7 xe-3-3.e4.iad1.cirn.net (209.222.130.29) 105.968 ms 106.036 ms 106.044 ms 8 66.117.37.180 (66.117.37.180) 101.005 ms 100.773 ms 101.520 ms 9 * * * 10 * * * 11 * * * 12 * * * 13 * * * 14 * * * 15 * * * 16 * * * 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 dns5.docforge.org (198.186.193.20) 4.241 ms 1.685 ms 0.271 ms I am guessing that this is a problem with the remote mail server 'a.mx.premore.net' since my server is sending and receiving email just fine to every other destination. I then decided to do a MX lookup for this domain premore.net see if there is anything wrong: ;; QUESTION SECTION: ;premore.net. IN MX ;; ANSWER SECTION: premore.net. 3093IN MX 0 a.mx.premore.net. ;; ADDITIONAL SECTION: a.mx.premore.net. 3093IN A 198.186.193.20 However my mail server wont send to this destination address and I have no idea why. Can someone tell me how I can better examine this situation to understand where the fault lies. Thank you! -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebra...@charite.de | http://www.charite.de
Re: What Is Causing This Failure
On Tue, 1 Dec 2009 10:03:21 -0500, you wrote: I am getting a report from someone on my network that they are getting delivery failures when attempting to send an email from my Postfix server to the remote mail server. I see the message stuck on my Postfix servers queue: CB87E778055 1337 Mon Nov 30 08:59:15 tprem...@iamghost.com (connect to a.mx.premore.net[198.186.193.20]: No route to host) b...@premore.net I am guessing that this is a problem with the remote mail server 'a.mx.premore.net' since my server is sending and receiving email just fine to every other destination. I then decided to do a MX lookup for this domain premore.net see if there is anything wrong: ;; QUESTION SECTION: ;premore.net. IN MX ;; ANSWER SECTION: premore.net. 3093IN MX 0 a.mx.premore.net. ;; ADDITIONAL SECTION: a.mx.premore.net. 3093IN A 198.186.193.20 However my mail server wont send to this destination address and I have no idea why. Can someone tell me how I can better examine this situation to understand where the fault lies. Thank you! Unless I'm misreading and misunderstanding your logs # telnet 198.186.193.20 25 Trying 198.186.193.20... telnet: connect to address 198.186.193.20: Operation timed out telnet: Unable to connect to remote host The mail server on that IP isn't answering.
Re: What Is Causing This Failure
* Evan Platt e...@espphotography.com: Unless I'm misreading and misunderstanding your logs # telnet 198.186.193.20 25 Trying 198.186.193.20... telnet: connect to address 198.186.193.20: Operation timed out telnet: Unable to connect to remote host The mail server on that IP isn't answering. # telnet 198.186.193.20 25 Trying 198.186.193.20... Connected to 198.186.193.20. Escape character is '^]'. 220 share.docforge.org ESMTP Postfix -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebra...@charite.de | http://www.charite.de
Re: What Is Causing This Failure
On Tue, 1 Dec 2009 16:13:02 +0100, you wrote: # telnet 198.186.193.20 25 Trying 198.186.193.20... Connected to 198.186.193.20. Escape character is '^]'. 220 share.docforge.org ESMTP Postfix D'oh... Forgot which machine I was connected to.I tried it on the one that has port 25 blocked by the ISP. :) My bad, sorry :)
Re: What Is Causing This Failure
On Tue, Dec 1, 2009 at 10:10 AM, Ralf Hildebrandt ralf.hildebra...@charite.de wrote: Works OK. What does tracroute 198.186.193.20 return? # traceroute 198.186.193.20 traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 60 byte packets ... snip ... 4 zr-pot1-te0-0-0-3.x-win.dfn.de (188.1.144.30) 5.288 ms 5.290 ms 5.281 ms 5 cr02.frf02.pccwbtn.net (80.81.192.50) 18.030 ms 18.027 ms 18.132 ms 6 carpathia.ge12-1.br02.ash01.pccwbtn.net (63.218.94.166) 109.111 ms 106.313 ms 106.528 ms 7 xe-3-3.e4.iad1.cirn.net (209.222.130.29) 105.968 ms 106.036 ms 106.044 ms 8 66.117.37.180 (66.117.37.180) 101.005 ms 100.773 ms 101.520 ms 9 * * * 10 * * * 11 * * * 12 * * * 13 * * * 14 * * * 15 * * * 16 * * * 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 dns5.docforge.org (198.186.193.20) 4.241 ms 1.685 ms 0.271 ms I am unable to connect via Telnet so it appears to be a network / ISP issue. car...@tunafish:~$ telnet 198.186.193.20 25 Trying 198.186.193.20... telnet: Unable to connect to remote host: No route to host
Re: What Is Causing This Failure
* Carlos Williams carlosw...@gmail.com: 25 dns5.docforge.org (198.186.193.20) 4.241 ms 1.685 ms 0.271 ms I am unable to connect via Telnet so it appears to be a network / ISP issue. car...@tunafish:~$ telnet 198.186.193.20 25 Trying 198.186.193.20... telnet: Unable to connect to remote host: No route to host What is the output of traceroute 198.186.193.20 ? -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebra...@charite.de | http://www.charite.de
Re: What Is Causing This Failure
On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt ralf.hildebra...@charite.de wrote: What is the output of traceroute 198.186.193.20 ? I get no results from my mail server: traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets 1 * * * 2 * * * 3 * * * 4 * * * 5 * * * . . . 29 * * * 30 * * * Strange...
Re: What Is Causing This Failure
Perhaps your mail server is on a DNSBL? Regards Frog - Original Message - From: Carlos Williams carlosw...@gmail.com To: postfix-users@postfix.org Sent: Tuesday, 1 December, 2009 4:05:25 PM Subject: Re: What Is Causing This Failure On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt ralf.hildebra...@charite.de wrote: What is the output of traceroute 198.186.193.20 ? I get no results from my mail server: traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets 1 * * * 2 * * * 3 * * * 4 * * * 5 * * * . . . 29 * * * 30 * * * Strange...
Re: What Is Causing This Failure
On Tue, 2009-12-01 at 16:27 +, Frog wrote: Perhaps your mail server is on a DNSBL? Regards Frog Nope, this is a problem at the ip level, routing. This is not a postfix or mail/smtp issue. - Original Message - From: Carlos Williams carlosw...@gmail.com To: postfix-users@postfix.org Sent: Tuesday, 1 December, 2009 4:05:25 PM Subject: Re: What Is Causing This Failure On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt ralf.hildebra...@charite.de wrote: What is the output of traceroute 198.186.193.20 ? I get no results from my mail server: traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets 1 * * * 2 * * * 3 * * * 4 * * * 5 * * * . . . 29 * * * 30 * * * Strange...
Re: What Is Causing This Failure
Frog wrote: Perhaps your mail server is on a DNSBL? Regards Frog - Original Message - From: Carlos Williams carlosw...@gmail.com To: postfix-users@postfix.org Sent: Tuesday, 1 December, 2009 4:05:25 PM Subject: Re: What Is Causing This Failure On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt ralf.hildebra...@charite.de wrote: What is the output of traceroute 198.186.193.20 ? I get no results from my mail server: traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets 1 * * * 2 * * * 3 * * * 4 * * * 5 * * * . . . 29 * * * 30 * * * Strange... why all the off topic posts today? --- chances are a router along the way is not forwarding icmp probes/responses correctly.. [10:39:23 r...@allover:~]# tcptraceroute 198.186.193.20 25 Selected device eth0, address 10.123.0.250, port 56230 for outgoing packets Tracing the path to 198.186.193.20 on TCP port 25 (smtp), 30 hops max 1 10.123.0.252 0.302 ms 0.133 ms 0.128 ms 2 bizXX.sta.linkcity.org.XX.22.72.in-addr.arpa (72.22.XX.XX) 0.412 ms 0.315 ms 0.312 ms 3 10.200.100.1 6.961 ms 0.499 ms 0.474 ms 4 sl-gw16-kc-3-1.sprintlink.net (160.81.151.109) 0.564 ms 0.437 ms 0.491 ms 5 sl-crs1-kc-0-5-0-0.sprintlink.net (144.232.11.152) 1.073 ms 0.827 ms 0.737 ms 6 sl-crs1-chi-0-1-0-3.sprintlink.net (144.232.18.214) 12.008 ms 12.409 ms 11.996 ms 7 sl-st20-chi-13-0-0.sprintlink.net (144.232.20.3) 11.603 ms 11.579 ms 11.569 ms 8 144.232.8.114 11.715 ms 11.777 ms 11.657 ms 9 ae-32-52.ebr2.Chicago1.Level3.net (4.68.101.62) 12.476 ms 21.324 ms 18.234 ms 10 ae-5.ebr2.Chicago2.Level3.net (4.69.140.194) 12.354 ms 12.639 ms 12.676 ms 11 ae-2-2.ebr2.Washington1.Level3.net (4.69.132.70) 33.594 ms 33.414 ms 33.252 ms 12 ae-62-62.csw1.Washington1.Level3.net (4.69.134.146) 46.577 ms 39.840 ms 35.910 ms 13 ae-1-69.edge2.Washington4.Level3.net (4.68.17.19) 33.635 ms 33.585 ms 33.636 ms 14 xe-0-2-0.cr1.iad1.us.nlayer.net (4.79.168.74) 33.761 ms 33.292 ms 73.096 ms 15 vl74.ar1.iad1.us.nlayer.net (69.31.31.190) 33.976 ms 33.986 ms 34.315 ms 16 as6450.vl134.ar1.iad1.us.nlayer.net (69.31.31.115) 33.968 ms 33.436 ms 33.511 ms 17 dns5.docforge.org (198.186.193.20) [open] 33.906 ms 33.987 ms 34.153 ms [10:39:25 r...@allover:~]#
Re: What Is Causing This Failure
On Tue, Dec 1, 2009 at 11:42 AM, Terry L. Inzauro tinza...@ha-solutions.net wrote: why all the off topic posts today? I suspected this to be Postfix or Mail related so I posted here. It was determined with the help of the list it was not a MTA issue. Simple as that! Sorry for any inconvenience.
Re: What Is Causing This Failure
Carlos Williams put forth on 12/1/2009 9:32 AM: I am unable to connect via Telnet so it appears to be a network / ISP issue. car...@tunafish:~$ telnet 198.186.193.20 25 Trying 198.186.193.20... telnet: Unable to connect to remote host: No route to host Definitely a network problem between you and the remote host. Works fine here in the US: greer:/etc/postfix# ping 198.186.193.20 PING 198.186.193.20 (198.186.193.20) 56(84) bytes of data. 64 bytes from 198.186.193.20: icmp_seq=1 ttl=51 time=79.1 ms 64 bytes from 198.186.193.20: icmp_seq=2 ttl=51 time=78.9 ms 64 bytes from 198.186.193.20: icmp_seq=3 ttl=51 time=78.7 ms 64 bytes from 198.186.193.20: icmp_seq=4 ttl=51 time=78.7 ms ^C --- 198.186.193.20 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3012ms rtt min/avg/max/mdev = 78.729/78.883/79.151/0.263 ms greer:/etc/postfix# telnet 198.186.193.20 25 Trying 198.186.193.20... Connected to 198.186.193.20. Escape character is '^]'. 220 share.docforge.org ESMTP Postfix quit 221 2.0.0 Bye -- Stan
