Hi,
> I am running Messaging server 6. Is it possible to
> have ENS send a notification to a external email
> address(outside my email domain) when a new message
> is recieved in the users mailbox?
This isn't how ENS works - ENS notifies a plugin when an even occurs, it doesn't _action_ the events per sea. You can write an ENS plugin that will get notified when a new message for a user is received and then manually send a notification email.
Why not just forward/redirect the email to the external email address using a sieve filter instead?
Regards,
Shane.