Currently , we can send mail to internet address and internal groups, but if groups are not assigned internet address , SMTP will send mail with internet address automatically assigned by default rules.
But external internet user can't reply these groups, because many user use secure SMTP relay services, and these service will not accept mail to non-registerd addresses. (i.e. IIJ SecureMX service)
Please warning when recipints in To/CC contains internet address and internal groups(internet address not assigned).
Also provide this function for iNotes.