Re: [CentOS] sendmail delay in presenting banner
On Sun, Mar 23, 2014, John R Pierce wrote: On 3/23/2014 11:49 AM, Gregory P. Ennis wrote: nslookup NAME.DOMAIN.com 127.0.0.1 I appropriately get 10.0.0.187 So far I am stumped on this problem, if any of you have suggestions I would appreciate your help in your DNS server, create a reverse zone for 10.0.0.0/8, like, 10.in-addr.arpa, even if it doesn't have any records other than NS and SOA. Another thing that can cause long delays is to use obsolete RBLs. Bill -- INTERNET: b...@celestial.com Bill Campbell; Celestial Software LLC URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way Voice: (206) 236-1676 Mercer Island, WA 98040-0820 Fax:(206) 232-9186 Skype: jwccsllc (206) 855-5792 ...I'm not one of those who think Bill Gates is the devil. I simply suspect that if Microsoft ever met up with the devil, it wouldn't need an interpreter. -- Nick Petreley ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] sendmail delay in presenting banner
I am using a Centos 6.5 machine as a mail server with sendmail as the MTA. I have a problem with a delay of sendmail presenting its banner so that the process of accepting e-mail can begin. The log files demonstrate as much as a 2 minute delay between the connection and the banner presentation. #telnet Mail.DOMAIN.com 25 Connected to mail. Escape character is '^]'. two minute delay before the next line is presented h220 Mail.DOMAIN.com. ESMTP Sendmail 8.14.4/8.14.4; Sun, 23 Mar 2014 10:17:44 -0500 Log entries on the mail server for the above connection: Mar 23 10:16:05 Mail sendmail[31229]: NOQUEUE: connect from NAME.DOMAIN.com [10.0.0.187] Mar 23 10:17:44 Mail sendmail[31229]: AUTH: available mech=GSSAPI CRAM-MD5 DIGEST-MD5, allowed mech=EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN I have made the observation that if I put in the following line in the access file the 2 min delay goes away Connect:10.0.0.187 RELAY Obviously I can not set up a relay for every ip address, but this does solve the problem for internal network delivery of mail to the mail server. I am using named for local dns service and have not been able to identify any errors or problems. When I evaluate nslookup NAME.DOMAIN.com 127.0.0.1 I appropriately get 10.0.0.187 So far I am stumped on this problem, if any of you have suggestions I would appreciate your help Greg Ennis ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] sendmail delay in presenting banner
This is probably being caused by DNS timeout trying to reverse-lookup the connecting IP. Check that your resolver (/etc/resolv.conf) is set correctly and responding to e.g. dig -x [IP-address] queries in a timely manner. If you are using DHCP, note that /etc/resolv.conf may be automatically created by the network setup scripts so manual edits may not stick. On Sun, Mar 23, 2014 at 8:39 AM, Gregory P. Ennis po...@pomec.net wrote: I am using a Centos 6.5 machine as a mail server with sendmail as the MTA. I have a problem with a delay of sendmail presenting its banner so that the process of accepting e-mail can begin. The log files demonstrate as much as a 2 minute delay between the connection and the banner presentation. #telnet Mail.DOMAIN.com 25 Connected to mail. Escape character is '^]'. two minute delay before the next line is presented h220 Mail.DOMAIN.com. ESMTP Sendmail 8.14.4/8.14.4; Sun, 23 Mar 2014 10:17:44 -0500 Log entries on the mail server for the above connection: Mar 23 10:16:05 Mail sendmail[31229]: NOQUEUE: connect from NAME.DOMAIN.com [10.0.0.187] Mar 23 10:17:44 Mail sendmail[31229]: AUTH: available mech=GSSAPI CRAM-MD5 DIGEST-MD5, allowed mech=EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN I have made the observation that if I put in the following line in the access file the 2 min delay goes away Connect:10.0.0.187 RELAY Obviously I can not set up a relay for every ip address, but this does solve the problem for internal network delivery of mail to the mail server. I am using named for local dns service and have not been able to identify any errors or problems. When I evaluate nslookup NAME.DOMAIN.com 127.0.0.1 I appropriately get 10.0.0.187 So far I am stumped on this problem, if any of you have suggestions I would appreciate your help Greg Ennis ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] sendmail delay in presenting banner
This is probably being caused by DNS timeout trying to reverse-lookup the connecting IP. Check that your resolver (/etc/resolv.conf) is set correctly and responding to e.g. dig -x [IP-address] queries in a timely manner. If you are using DHCP, note that /etc/resolv.conf may be automatically created by the network setup scripts so manual edits may not stick. On Sun, Mar 23, 2014 at 8:39 AM, Gregory P. Ennis po...@pomec.net wrote: --- Bart, Thanks for your help. It smells like a DNS problem to me as well in particular I can fix the problem with a statement in the access file like Connect:10.0.0.186 RELAY When I checked reverse look up using 'dig -x [ip] I am not having any problems, and /etc/resolv.conf on the mail server is set where it is supposed to be 127.0.0.1 ; I have also tried pointing this to other dns servers, and I get the same problem. I have expanded the log file entry to : define(`confLOG_LEVEL', `29')dnl But this does not give me any more information other than there is a clear delay between the time of connecting and the time the sendmail banner is produced by the mail server. I am also not seeing any problem in the named.log file. Greg Ennis ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] sendmail delay in presenting banner
Date: Sun, 23 Mar 2014 10:39:34 -0500 I am using a Centos 6.5 machine as a mail server with sendmail as the MTA. I have a problem with a delay of sendmail presenting its banner so that the process of accepting e-mail can begin. The log files demonstrate as much as a 2 minute delay between the connection and the banner presentation. #telnet Mail.DOMAIN.com 25 Connected to mail. Escape character is '^]'. two minute delay before the next line is presented h220 Mail.DOMAIN.com. ESMTP Sendmail 8.14.4/8.14.4; Sun, 23 Mar 2014 10:17:44 -0500 Log entries on the mail server for the above connection: Mar 23 10:16:05 Mail sendmail[31229]: NOQUEUE: connect from NAME.DOMAIN.com [10.0.0.187] Mar 23 10:17:44 Mail sendmail[31229]: AUTH: available mech=GSSAPI CRAM-MD5 DIGEST-MD5, allowed mech=EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN I have made the observation that if I put in the following line in the access file the 2 min delay goes away Connect:10.0.0.187 RELAY Obviously I can not set up a relay for every ip address, but this does solve the problem for internal network delivery of mail to the mail server. I am using named for local dns service and have not been able to identify any errors or problems. When I evaluate nslookup NAME.DOMAIN.com 127.0.0.1 I appropriately get 10.0.0.187 So far I am stumped on this problem, if any of you have suggestions I would appreciate your help Greg Ennis --- Problem is solved a bit of an embarrassment ... I had two blacklisted services that were no longer active as a FEATURE in my sendmail.mc file. combined.njabl.org blackholes.mail-abuse.org Does anyone use other comparable services like these? Greg Ennis ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] sendmail delay in presenting banner
On 3/23/2014 11:49 AM, Gregory P. Ennis wrote: nslookup NAME.DOMAIN.com 127.0.0.1 I appropriately get 10.0.0.187 So far I am stumped on this problem, if any of you have suggestions I would appreciate your help in your DNS server, create a reverse zone for 10.0.0.0/8, like, 10.in-addr.arpa, even if it doesn't have any records other than NS and SOA. ideally, list all your local hosts on it. -- john r pierce 37N 122W somewhere on the middle of the left coast ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
