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This procmail version has been updated to first remove low priority headers from messages before filtering:
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# Remove low priority headers by piping through formail. # If end-users filter on low priority headers, this will avoid # false positives. This is a procmail "or" rule requiring any # of the four headers to trigger. :0fw: formail1.lock * ^X-Priority: 5|\ ^Priority: Non-Urgent|\ ^Importance: low|\ ^X-MSMail-Priority: Low | formail -I "X-Priority" -I "Priority" -I "Importance" -I "X-MSMail-Priority" :0fw: spamassassin.lock * < 256000 | spamassassin # Pipe likely spam through formail adding # the four headers that represent low priority :0fw: formail2.lock * ^X-Spam-Flag: YES | formail -I "X-Priority: 5" -I "Priority: Non-Urgent" -I "Importance: low" -I "X-MSMail-Priority: Low" |
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