From: John Baker (johnnybmarlboro.edu)
Date: Thu May 01 2008 - 10:27:13 CDT

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Hi

I have only used headers checks to hold for spam scanning.

But today after a phising scam came in purporting to be from our
helpdesk I put one like this in to block users from replying:

/^To: fromthehelpdesk2007gmail.com/ REJECT

And then I get this warning when I run postmap /etc/postfix/header_checks

postmap: warning: /etc/postfix/header_checks, line 1: record is in "key:
value" format; is this an alias file?

It appeared from all the information I could find that I was going about
this the right way and the check actually does seem to work.

But I'm not clear on exactly what is going on. Why do I get this warning
and is there a proper way to do this that will make the warning stop
when I add a header_check?
--
John Baker
Network Systems Administrator
Marlboro College
Phone: 451-7551 off campus; 551 on campus

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