Analogous to spam-use-whitelist (see Blacklists and Whitelists), but uses the BBDB as the source of whitelisted
addresses, without regular expressions. You must have the BBDB loaded
for spam-use-BBDB to work properly. Messages whose senders are
not in the BBDB will be sent to the next spam-split rule. This is an
explicit filter, meaning that unless someone is in the BBDB, their
messages are not assumed to be spam or ham.
Set this variable to t if you want to use the BBDB as an
implicit filter, meaning that every message will be considered spam
unless the sender is in the BBDB. Use with care. Only sender
addresses in the BBDB will be allowed through; all others will be
classified as spammers.
While spam-use-BBDB-exclusive can be used as an alias
for spam-use-BBDB as far as spam.el is concerned, it is
not a separate back end. If you set
spam-use-BBDB-exclusive to t, all your BBDB splitting
will be exclusive.
Add this symbol to a group’s spam-process parameter by
customizing the group parameters or the
gnus-spam-process-newsgroups variable. When this symbol is
added to a group’s spam-process parameter, the senders of
ham-marked articles in ham groups will be added to the
BBDB.
WARNING
Instead of the obsolete
gnus-group-ham-exit-processor-BBDB, it is recommended
that you use (ham spam-use-BBDB). Everything will work
the same way, we promise.