mimeheader rule problem

[Martin Gregorie <ma...@gregorie.org>]

I seem to be misunderstanding something about writing mimeheader rules.

I'm trying to match these MIME headers:

Content-Type: text/plain; charset = "utf-8"
Content-Transfer-Encoding: base64

Content-Type: text/html; charset = "utf-8"
Content-Transfer-Encoding: base64

with these rules:

mimeheader MG_CT1  Content-Type =~ /text\/(plain|html)/i
mimeheader MG_CT2  Content-Transfer-Encoding =~ /base64/i 

The first rule fires but not the second. What have I not understood?

Also, I haven't found a manual page that lists the MIME-headers the
plugin can handle. This one doesn't give much detail:
http://search.cpan.org/~jmason/Mail-SpamAssassin-3.3.1/lib/Mail/SpamAssassin/Plugin/MIMEHeader.pm

A reference to a more comprehensive description would be gratefully
received.


Martin