Re: [Exim] Mail Loop with Null Senders and Oracle WorkFlow

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Author: Kevin Reed
Date:  
To: exim-users
Subject: Re: [Exim] Mail Loop with Null Senders and Oracle WorkFlow
Tim Jackson said:
> Hi Kevin, on Sat, 31 Jan 2004 16:12:54 -0700 (MST) you wrote:
>
>> Last week we had the fun of having a mail loop that was caused by the
>> use of a Oracle Workflow mailer and any bounce message sent back to it.


> I don't yet have an Exim rule to solve this; I've suggested to the
> offending site which bombed me with their looping mail (who have Exim as
> front-end MTAs) that they use a system filter to insert a unique "token"
> header (e.g. "X-Flooble: Anti-loop") into locally-generated or received
> bounces, and then again with the system filter (before the addition
> of the header) check for that "token" in the message body of
> received/generated bounces - if it exists, assume it's a loop and
> devnull it. ...


I thought of doing something like that... but I'm not sure that will work.
I don't think you will get back the same headers especially on those
systems that accept the message and bounce back a different message.

It might be buried in the reply somewhere but not be part of the regular
headers but sometimes you don't even get the same message back at all,
like in a Out of Office reply which had the same effect.

The solution I came up works well, but of course you need to know that
that type of thing exists first and know all the accounts that it uses.

The finacial folks were a bit peeved when I wouldn't turn mail back on
directed at their WFM system until I had a fix for it. The so called
Oracle expert on site from Oracle didn't have a clue about it or what I
was talking about.

--
Kevin W. Reed - TNET Services, Inc.
Unoffical Exim MTA Info Forums - http://exim.got-there.com/forums