[40163] in North American Network Operators' Group
Re: trapdoor.merit.edu and other impatient Postfix mailers everywhere
daemon@ATHENA.MIT.EDU (John Fraizer)
Thu Aug 2 18:26:44 2001
Date: Thu, 2 Aug 2001 18:22:55 -0400 (EDT)
From: John Fraizer <nanog@Overkill.EnterZone.Net>
To: kai@pac-rim.net
Cc: nanog@nanog.org
In-Reply-To: <2098758637.20010802132239@conti.nu>
Message-ID: <Pine.LNX.4.21.0108021822050.3097-100000@Overkill.EnterZone.Net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Errors-To: owner-nanog-outgoing@merit.edu
On Thu, 2 Aug 2001 kai@pac-rim.net wrote:
>
> If you are receiving larger numbers of reports about failing mail
> transport from your customers these days, here is why.
>
> Apparently, the nameservers for the blackholes.mail-abuse.org and
> dialups.mail-abuse.org zones are overloaded (I get <10% ICMP_echo's
> back, and virtually never any DNS answers), causing a more than
> 60-second connection-established -> 220 Hello banner
> answering delay on typical Unix-based Sendmail (and other SMTP)
> servers with default DNS resolver timeouts.
I noticed the same thing this afternoon but, only with
trapdoor.merit.edu. All other mail was making it in fine.
---
John Fraizer
EnterZone, Inc
