Adapted a procmail spam filter for use by maildrop (used by courier mail server). Any identified spam has a header added that marks it as spam and gives a reason. Also converts mime parts of content type text/html into text/plain in suspect e-mails.
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Updated the filter for maildrop that adds a header line to mails identified as spam for later sorting or deletion.
- Release 1.1 1) Changed screen for message id's. Still require FQD though. Message-id must adhere to RFC 850: unique@fulldomain.name where unique is anything but space, "@", "<", and ">" and fulldomain is anything alphanumeric with at least one ".". --Update: removed requirement for at least one "." in FQD due to excessive false positives. 2) Strengthened the html stripping sed command to be less case sensitive. 3) Added two known spammer addresses specific to places that I get spam from. 4) Added '**' to list of subjects that are likely spam. 5) Added "unknown" to list of To: addresses probably from spammers. 6) Changed check for "Undisclosed Recipients" to be both in the To: and Cc: lines. 7) Added check for five consecutive spaces in the subject line to the list of common spam subjects. 8) Added line to check for '<<' or '>>' in subjects. 9) Refined the "ugly address" check. 10) Changed default for CHECKUNKNOWN to False -- was generating too many false positives. 11) Removed check for empty Subject line -- generating too many false positives.
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