gnus: Group Maintenance

 
 2.13 Group Maintenance
 ======================
 
 ‘b’
      Find bogus groups and delete them
      (‘gnus-group-check-bogus-groups’).
 
 ‘F’
      Find new groups and process them (‘gnus-group-find-new-groups’).
      With 1 ‘C-u’, use the ‘ask-server’ method to query the server for
      new groups.  With 2 ‘C-u’’s, use most complete method possible to
      query the server for new groups, and subscribe the new groups as
      zombies.
 
 ‘C-c C-x’
      Run all expirable articles in the current group through the expiry
      process (if any) (‘gnus-group-expire-articles’).  That is, delete
      all expirable articles in the group that have been around for a
      while.  (SeeExpiring Mail).
 
 ‘C-c C-M-x’
      Run all expirable articles in all groups through the expiry process
      (‘gnus-group-expire-all-groups’).