Subaddresses

   If you enter a subaddress into your personal alias database as
   a public alias, then you can have mail sent to you with that
   subaddress automatically forwarded. For example, suppose that
   your address is bob@example.com and mail to you from the STAFF
   mailing list arrives addressed to bob+staff@example.com. If
   you create a public alias for staff then mail to the address
   bob+staff@example.com will be forwarded to the address associated
   with the alias. For instance, the commands

   db> add staff bob+staff@naples.example.com
   db> set staff public

   cause mail sent to bob+staff@example.com to be forwarded to
   bob+staff@naples.example.com.