+ Define the list (=) of accepted keywords. This changes the default set
+ of keywords accepted by a user.
+
+<tag><tt>keywordall [<email>] {+|-|=} <list of keywords></tt>
+<item>
+ Accept (+) or refuse (-) mails classified under the given keyword(s).
+ Define the list (=) of accepted keywords. This changes the set of
+ accepted keywords of all the currently active subscriptions of a user.