Date: Wed, 5 Dec 2001 21:47:16 -0800 From: "Dave Atkins" <dave@atkinshome.com> To: "'Anthony Kim'" <niceshorts@yahoo.com> Cc: <freebsd-questions@freebsd.org> Subject: RE: sendmail times out connecting to local mailserver Message-ID: <002801c17e19$766cd290$6700a8c0@atkinshome.com> In-Reply-To: <20011206034057.GB3737@boethius.telocity.com>
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Thanks, Yes, there is a PIX in front of these servers, but they are on the same subnet with an Alteon switch. I have been debugging from another freebsd box at my desk which uses a backdoor T1 to the datacenter. It seems as long as we are working on the private network, the PIX would not be involved, but I'm not sure. Could the Alteon be dropping those packets too? I have tried to simplify things by using our main mail server as a relay-which works for other servers in the data center (which use windows-based mail servers, not sendmail). But still, no luck with sendmail. The relay server sometimes gets the email, after it sits in the queue for many retries. telnet on port25 works, but I don't know how to test the packet level stuff -----Original Message----- From: Anthony Kim [mailto:niceshorts@yahoo.com] Sent: Wednesday, December 05, 2001 7:41 PM To: Dave Atkins Cc: freebsd-questions@freebsd.org Subject: Re: sendmail times out connecting to local mailserver On Wed, Dec 05, 2001, Dave Atkins wrote: > I have a freeBSD box in our datacenter with a bunch of Windows > servers. When I attempt to send an email, it times out when > attempting to deliver to our local mailserver. If I attempt to > send to an address outside our network, it works...but very > slowly. There is a 10-15 second delay before the message is > accepted for delivery. In the case of our local mailserver, it > just times out. > Dave, I believe you may be suffering from 2 separate problems. Sendmail delays are often caused by a firewall (you have a PIX right?) dropping ident requests, which sendmail likes to do. Configure your firewall to respond to TCP/113 SYNs with RST, to see if this improves your mail speed. Secondly, internally, you're better off splitting DNS - separating public from private. That way, you could safely set up an MX record in your private DNS name space pointing to your private IP 192.168.x.x instead of mail routing out to your public, published address. If you don't want to do that, you may have to set up each of your internal mail servers to use feature(mailertable) in order to disregard DNS for specified domains. In postfix, this feature uses the "transport" table. In qmail, it is called "smtproutes". HTH, -- "Le motd juste." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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