Possible to force tls/ssl for smtp client connections?

Hello is it possible to force ssl/tls client smtp connections for my users? Meaning they have to use and encrypted connection only? if no encryption the connection is refused.

I currently have ssl/tls working and i have ports 25,587 and 465 currently working. I want to force users to use 465?

Thanks..

 

Yes, this is possible. See:

http://postfix.1071664.n5.nabble.com/force-tls-but-allow-amavis-td34884.html

 

Thanks!