> 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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