authenticated users from different networks

[Vieri Di Paola]

Hi,

I am currently allowing "trusted" network IP addresses to send/relay
e-mail, as well as allowing SASL authenticated users to do the same
from whichever IP address (but enforcing MAIL FROM to be
username@mydomain). Both of these can send/relay e-mails to external
domains.

Now, I'd like to do the same, but SASL authenticated users:

1) can relay emails to other domains ONLY if connecting from my local network

2) can send e-mails only to "mydomain" if connecting from an outside network

Is this possible?

Vieri