Try setting up the email forwarding for your 'info@server.com' account to point to a group name, like 'info_group'. Make sure you add the users to the 'info_group' group.
Here is info taken right from the server manager in SME V5 -
"The March Networks Server automatically creates an e-mail alias for each group. If you want to define an e-mail alias for a list of users, simply create a group and the list will automatically be maintained by the server."
Should do the trick, let us know.
Regards,
Patrick