[Mailman-Users] Erratic mail delivery times

Barry S. Finkel bsfinkel at att.net
Tue Jul 15 03:55:42 CEST 2014

 >> -----Original Message-----
 >> From: Mark Sapiro [mailto:mark at msapiro.net]
 >> Sent: Monday, 14 July 2014 10:55 PM
 >> To: Peter Shute; GNU mailman users
 >> Subject: Re: [Mailman-Users] Erratic mail delivery times
 >> On July 14, 2014 4:29:16 AM PDT, Peter Shute
 >> <pshute at nuw.org.au> wrote:
 >>> Can I assume this has nothing to do with mailman?
 >> Look at the Received: headers in the received message to
 >> determine where the delay is.
 >> Could grey listing be involved?
 >> --
 >> Mark Sapiro <mark at msapiro.net>
 >> Sent from my Android phone with K-9 Mail. [Unpaid endorsement]

On 7/14/2014 8:43 PM, Peter Shute wrote:
> Would grey listing show up in the headers? We haven't installed grey listing here, but who know what our anti spam does. If it's using it then it certainly isn't using it consistently. I can't see anything in the Exchange Message Tracking logs that shows anything unusual as they come in. They simply arrive late.
> I dumped from Outlook the last few weeeks of send and received times for stuff I've received from this list. Some of the delays will be moderation time, but I can see that the number of messages delayed longer than a few minutes increased greatly on 11/7/14, but that there is still the occasional one that comes though within a minute.
> These are the top two headers from a delayed message. Does this tell me anything other than it was received by the server upstream of mine 21 minutes before it was received by mine? If so then the delay could be before that upstream server sent it on, or while it waited for my server to accept it. If it tried several times, would that be shown in the headers?
> Received: from s26.web-hosting.com ( by NUWVICMS2.nuw.org.au
>   ( with Microsoft SMTP Server id 8.1.436.0; Fri, 11 Jul 2014
>   09:11:01 +1000
> Received: from localhost ([]:37183 helo=server26.web-hosting.com)	by
>   server26.web-hosting.com with esmtp (Exim 4.82)	(envelope-from
>   <birding-aus-bounces at birding-aus.org>)	id 1X5NAu-001sA8-Fw; Thu, 10 Jul 2014
>   18:50:48 -0400

The server26 machine accepted the mail from localhost at 18:50:48 .
The NUWVICMS2 machine accepted the mail from server26 at 09:11:01
The time difference is 9:12 + 11:01 = 20:12.  Twenty minutes seems
a long time for greylisting.  You would have to look at the mail logs
from the NUWVICMS2 machine to see what it was doing from 08:50 until
09:11 (GMT+1000) to know why the mail was delayed.  Also, the logs
on the server16 machine would probably tell if server26 tried an earlier
connection to the NUWVICMS2 machine.

--Barry Finkel

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