Restrict outgoing email for some users

Hi,

I would like to have email ID which can only recieve email but restrict for sending out. Is it possible ? if yes then how ? share me your idea or experience.

Thank you.

Check this:

http://www.postfix.org/RESTRICTION_CLASS_README.html

...on the section "Restricting what users can send mail to off-site destinations".

But in my opinion, this could be not effective, as descripted:

Note: this scheme does not authenticate the user, and therefore it can be bypassed in several ways:

By sending mail via a less restrictive mail relay host.

By sending mail as someone else who does have permission to send mail to off-site destinations.

Regards,
Netino

Thanks for your reply.