Re: [exim] Exim maximum line length limit

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Author: Janne Snabb
Date:  
To: exim-users
Subject: Re: [exim] Exim maximum line length limit
On 2012-05-10 16:12, Janne Snabb wrote:
> deny    condition = ${if > {$max_received_linelength}{1024}}
>         message = Maximum line length here is 1024 characters.


Just an additional observation:

I checked a sample of 61146 mostly non-spam e-mails and noticed that 42
successfully received legitimate e-mails had lines longer than 998
characters. Thus the ACL above would have caused unwanted bounces. None
of the sampled messages had lines longer than 4000 characters (except
the spam mail which I received today and which triggered the DKIM
signing issue).

I relaxed the above ACL condition on my server to accommodate for a bit
longer lines, but less than the 16k limit imposed by the DKIM filter. I
suppose most MTA:s accept and some MUA:s send more than 998 characters
on a line without problems.

--
Janne Snabb / EPIPE Communications
snabb@??? - http://epipe.com/