The Group Distribution module allows powerful group forwarding features, allowing email discussion groups to be setup, including closed, internal and public groups. Sophisticated rules allow you to determine who can and can't send to a group, what sort of content they can send (for example, you may wish to prevent large attachments going to a mobile sales force on dial-up).
Internal Groups that only internal users can email to
Automatic Group resolution to prevent group feedback and autoresponders to groups
Closed Groups that only group members can email to
Send to group based on phrases or wildcards in the contents
Send to group based on phrases or wildcards in the subject line
Automatic identification of group emails
Outgoing lists and groups also supported, with address hiding
External group responses rerouted to original sender
Message size restrictions
Group distribution address hiding
Attachment size and type restrictions
Attachment removal
Attachment compression
Autoresponse to group elimination
Group passwords
Email subscribe requests
Automatic group signature
Support for Newsletter format
Moderator controlled groups
Multiple moderators
Sequential moderators
Internal/Closed group postings can be moderated
Automatic discussion archiving
Automatic message digests