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List:       exim-users
Subject:    Re: [exim] suspected mail loop - Not
From:       graeme vetterlein via Exim-users <exim-users () exim ! org>
Date:       2023-03-03 13:42:13
Message-ID: ffb43cdc-fc81-8d62-b5df-f639aa44d53a () vetterlein ! com
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> Re: [exim] suspected mail loop - Not.eml
>
> Subject:
> Re: [exim] suspected mail loop - Not
> From:
> Viktor Dukhovni <exim-users@dukhovni.org>
> Date:
> 17/02/2023, 16:18
>
> To:
> graeme vetterlein via Exim-users <exim-users@exim.org>
>
>
> On Thu, Feb 16, 2023 at 01:54:23PM +0000, graeme vetterlein via 
> Exim-users wrote:
>
>> However, tracking the original message down, it was from IBM and 
>> contains e.g.
>>
>> *29 matches for "Received" in buffer: 
>> 1670514307.H745399P3100673.ybox.xxx *
>>
>> and they all appear legitimate** , it really did pass through 29 
>> servers !
> An impressive hop count, did it go through mailing lists and then get
> forwarded from a user's portable email address (an alumni alias or
> similar) to their current actual mailbox?

It was an "office admin post"  (Office closed, water leak)  I guess it 
started on somebody's laptop, then to his incoming gateway, hence to

a central(ish) mail server, out to some group server, hence to mail 
automation, then a "mailing list" sender, couple more virus checks etc, 
finally my MX record, which is a relay/rewriter , to my ISP and finally 
my mail server.


..problem being , it will likely always follow this route (so I'll use 
the advice from Heiko [below]). Just wondering if the current default is 
OK for recent usecases (maybe this is is unusual ? or Maybe it's getting 
common?)



>
> On Fri, Feb 17, 2023 at 10:13:28AM +0100, Heiko Schlichting via 
> Exim-users wrote:
>
>> That's hard to answer. The following is set on our servers:
>>
>> $ exim -bP received_headers_max
>> received_headers_max = 50
> FWIW, this (50) matches the Postfix default:
>
> http://www.postfix.org/postconf.5.html#hopcount_limit
>
> -- Viktor.


# exim -bP received_headers_max
received_headers_max = 30


OK, looks like I'll go to 50 too. Thanks Heiko & Viktor.



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