> Hi, > > Recently, I received a request to block a user, he > can still receive his messages but he cannot send. Which is > the best approach to achieve this? Any ideas?
If user has unrestricted access to smtp, www or any uncontrolled external server, he can send email. Leave one open port and you are screwed. Any port can be used to create tunnel to external server and tunnel removes restrictions placed on user. Control user by setting access rules on your router and smtp server. -- Tomas
