Grep only mail headers via STDIN?

[Jens Benecke <jens@spamfreemail.de>]

Hi,

I want to create a script that greps for a specific mail header coming from
STDIN. "mailgrep" and "mboxgrep" don't work, they need files to work on,
but the mail comes via STDIN.

So I need to write something like

| condredirect spam@mydomain.lan egrep "^X-Spam-Flag: YES" 

BUT where grep would "exit 1;" and not search any further when it encounters
the first empty line (the end of the mail headers)


Backgroud: I want to filter SPAM but I don't want to filter attached SPAM
that people forward to me to analyze. So I can't just grep for
"X-Spam-Flag:".


Thanks!
-- 
Jens Benecke (jens at spamfreemail.de)
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