We support addressing using the '+' character, e.g. <user+mbox@domain> to send email straight to a user folder. In this example, mail to <joe+work.list2@domain> is delivered directly iff the mailbox exists and its ACL is set properly (otherwise it goes to Joe's INBOX, user.joe).

From within Webmail, click on "My Folders" to manage folder ACLs, and Edit the folder in question. The ACL flags are grouped into four: Read, Write, Mail, and Admin. Add a line for the special user "anyone" and turn on the Mail checkbox for this entry.

In command-line terms (via SSH):

MAILBOX ADD user.joe.work.list2
MAILBOX SETACL user.joe.work.list2 anyone +p 

Or use <+shared.sub@domain> to mail directly to shared folders, i.e. those not under any individual user's inbox. For instance, create an archive folder for each distribution list:

DL ADD managers
DLENTRY ADD managers joe
DLENTRY ADD managers bill@otherdomain
MAILBOX ADD archive.managers
MAILBOX SETACL archive.managers anyone +p
DLENTRY ADD managers +archive.managers