comp.os.linux.networking

On Sat, 22 Mar 2008 15:57:57 GMT, Jack Snodgrass
wrote:

>There are a couple of mail servers - charter.net and
>mta.email.ichotelsgroup.com that give me the
>timeout after DATA from
>message in my mail.log.
>
>I am running post fix.
>
>I get lots of mail from other servers... but these two keep trying over
>and over again and give me these timeout messages.
>
>Any idea what might be causing this?
>
>Any postfix gurus that can suggest a setting I can tweak.
>
>This is going via a tunnel from a fixed ip address to my mail
>server on the other end of the tunnel. mail from gmail and my
>office and other sites don't have issues.. my log just shows
>charter.net and ichotelsgroup.com as servers having issues.
>
>jack
I'm no postfix guru, though I do run it.

I'd suggest that you try a Wireshark dump. Since other mtas are able
to talk, then suspect a firewall setting or other foreign
interference. It certainly isn't impossible that you have something
weird in your postfix setup, but for it to be so specific would be
unusual.

charter.net has been on (and off again) many black hole lists. I
don't know its current status, but you should see if others also have
a problem with it.

If you have ECN (congestion) enabled, make sure that isn't a problem
for some router in the path.
--
buck