#18 add Precedence junk header

open
nobody
None
5
2006-07-13
2006-07-13
ohauer
No

It will be a nice feature to add header like
'Precedence: bulk or junk' at a coustom SPAM Level.

for example:
mails are only tagged never deleted if they pass the
first mailrelay.
Backend Servers like Exchange and others will never
send an Absense Message if this header is found.

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