gnus: Regular Expressions Header Matching
9.17.6.6 Regular Expressions Header Matching
............................................
-- Variable: spam-use-regex-headers
This option is disabled by default. You can let Gnus check the
message headers against lists of regular expressions when you set
this option. The variables ‘spam-regex-headers-spam’ and
‘spam-regex-headers-ham’ hold the list of regular expressions.
Gnus will check against the message headers to determine if the
message is spam or ham, respectively.
-- Variable: spam-regex-headers-spam
The list of regular expressions that, when matched in the headers
of the message, positively identify it as spam.
-- Variable: spam-regex-headers-ham
The list of regular expressions that, when matched in the headers
of the message, positively identify it as ham.
Regular expression header checks are done only on incoming mail.
There is no specific spam or ham processor for regular expressions.