Question:

private message sending for internal group users?

Answer:

we have the module that includes sending  private messages  to their group or to perticular member of the same group. you can choose a member from the group or group to send message.Its easy to intall and work out.

Question:

send mass mail to particular user group?

Answer:

We have this functionality for the admin. Admin can send html content (FCK Editor) to the perticualr group of users from admin panel. Offers related information notification to the perticular user groups and send some invitations, gifts and wishes.