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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.