closing port 25

[3inetworks]

Customer just doesn't want his staff to connect to server at port 25. So, we will need to block port 25 from his staff. I can keep Postfix use port 25, but is there any restriction from Postfix can be done, to prevent his staff to connect to server at port 25?

Thanks.

[irfan]

I think you can add a rule in your firewall to block incoming connections on port 25 from their (client's) network.