MIMEHeader - perform regexp tests against MIME headers


  loadplugin    Mail::SpamAssassin::Plugin::MIMEHeader
  mimeheader    NAME_OF_RULE    Content-Id =~ /foo/


This plugin allows regexp rules to be written against MIME headers in the message.


mimeheader NAME_OF_RULE Header-Name =~ /pattern/modifiers
Specify a rule. NAME_OF_RULE is the name of the rule to be used, Header-Name is the name of the MIME header to check, and /pattern/modifiers is the Perl regular expression to match against this.

Note that in a message of multiple parts, each header will be checked against the pattern separately. In other words, if multiple parts have a 'Content-Type' header, each header's value will be tested individually as a separate string.

Header names are considered case-insensitive.

The header values are normally cleaned up a little. Append :raw to the header name to retrieve the raw, undecoded value instead.