Thanks ! I use a printed version of the v4.50 documentation, where this variable didn't exist. I can now issue a 5xx error during the SMTP session when it reaches 20kbytes, rather than sending a mailerdaemon with 'local delivery failed' afterwards.
The full story is that my MDA, a slighly modified version of the Atmail MDA, crashes when accessing the header via the Maill::Message Perl object :
Sep 29 15:24:30 webmail-5 exim[32417]: 1Mscgu-0008Qe-Gd ** <HIDDEN_ADDRESS> R=routeur T=transport: Child process of relais_externe_test transport (running command "/path/to/mymda.pl $sender_address $local_part@$domain") was terminated by signal 9 (Killed)
----- Original Message ----
From: "Lena@???" <Lena@???>
To: exim-users@???
Sent: Tuesday, September 29, 2009 1:22:15 PM
Subject: Re: [exim] Header size
> From: Christian Gregoire
> Is there a way, at ACL DATA time, to check for the header size ? I have
> a buggy MDA which crashes when handling messages such as those from
> mailing lists where recipients are not hidden thus with many header lines.
You can check, but what'd you do?
condition = ${if >{${strlen:$message_headers_raw}}{10000}}
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