I'm having a great deal of trouble writing a rule to match something in
a Received: header. The problem is that sendmail(?) is whitespace
wrapping the header. In other words, instead of:
Received: from [192.168.1.31] (mux.example.com [1.2.3.4]) by
mail.example.com (8.14.4/8.14.4) with ESMTP id abc1234
(version=TLSv1/SSLv3 cipher=DHE-DSS-CAMELLIA256-SHA bits=256 verify=NO) ...
(i.e. the header is on one line with spaces between items and \n on the end)
I'm getting (if this mailing list doesn't mangle it):
Received: from [192.168.1.31] (mux.example.com [1.2.3.4])
by mail.example.com(8.14.4/8.14.4) with ESMTP id abc1234
(version=TLSv1/SSLv3 cipher=DHE-DSS-CAMELLIA256-SHA bits=256 verify=NO)
....
(i.e. it's wrapped with continuation lines prefixed with a \t)
Now here's the thing. I'd assumed that a rule testing a header would
handle the complete header line, even when wrapped. It doesn't.
In the example, this matches:
header TEST_RULE Received =~ /mux.example.com/
This doesn't:
header TEST_RULE Received =~ /ESMTP/
I *really* need to match something on the third line! I tried using \t
as the name of the header - a bit desperate and also futile.
Is this feature there by design? Is there a work-around? Do I just not
understand the perl regexp well enough? If all else fails, does anyone
know how to stop sendmail wrapping the headers, although this isn't a
general solution.
Thanks, Frank.
