nixCraft

hi all,
Now, I have sendmail configured. Now, as u know all the lan users are able to send mail to outside local lan i.e to gmail.com or yahoo.com
Now, the problem is how to restrict some users so that they can't send mail to outside network. Also, they should be able to send mail within local lan.

By default user can not reboot or mount cdrom. Here is the example for the same:

Open /etc/mail/access file and add username/hostname to deny:
Restart sendmail to take effect.

but dear, this would block that user in local lan also. i.e. that user won't be able to send mail within the lan.
and I think, entries in the /etc/mail/access go like this...
user@localhost REJECT

Again, I clear the question, I just want that some users should not be able to send mail outside local lan. i.e they should not be able to send mail to www.gmail.com or www.yahoo.com,etc. but at the same time, they are able to send or receive mail from or to local lan. Please note it carefully...........