Re: [exim] Counting the number of headers in an incoming email

Author: Lena
Date:
To: exim-users
Old-Topics: [exim] Counting the number of headers in an incoming email (was Re: Limit the total number of headers in incoming SMTP messages?)
Subject: Re: [exim] Counting the number of headers in an incoming email

> From: Chris Siebenmann

> We use a commercial anti-spam system behind our Exim-based inbound MX
> gateway that turns out to be unhappy if a message has 'too many' headers
> (where this is an undocumented value of more than 512 headers). I'd like
> to detect and reject these messages in the DATA phase

deny message = This message has too many header lines (>512)
     condition = ${if match{$message_headers}{\N(\S.+\n(\s.+\n)*){512}\N}}

> Exim inserts a Received: header of its own on top

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