Only subscriber objects can receive messages from a remote Unity network via SMTP networking. (btw...the same applies to the AMIS, Bridge and VPIM networking features).
A 'trick' you could use is to create a Unity subscriber account on Unity network A for the sole purpose of forwarding to a distribution list. In the Outlook client for that subscriber, use the Tools wizard to create a rule to forward received messages to the desired dl(s) and/or recipients.
Now people in Unity network B can address to this subscriber on Unity network A and the message will get forwarded to the desired recipients.
This would not be an officially supported procedure, but it should achieve what you're looking for on a small scale. Maintenance of something like this could get messy if done on a large scale.
There's nothing specific like this planned in the immediate future that I know of. But this and similar questions have come up before. Be sure to enter a PERS for this so marketing is aware of the desire for this. Thanks.
