Currently mails to a role can only be sent via the web frontend.
But it would be better if the role can have a mail address.
The mailadress must be checked (pop3/imap) and incoming mails are forwarded to either to all role members or only to the role leaders. The check could be triggered by a cron job.
This would be a nice feature, because now you have to make sure that the role configuration in admidio matches the forward configuration of the mail transfer agent.