On 17 Nov 2015, at 03:01, Daniel Oakes <[email protected]> wrote:
> What I'm trying to do is log a specific header line in the received: portion 
> to a different log file.

You need the ${run{/some/script}} expansion construct. In a simple (and 
untested!) form:

warn condition = ${run{/bin/echo "${sg{$h_Received:}{\Nregex 
here\N}{replacement}}"}{true}{true}}

Regards

Graeme
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