[asterisk-users] OT: fail2ban, spam and mail servers

[A J Stiles]

On Tuesday 13 Jul 2010, Randy R wrote:
> I was thinking of closing port 25 and using an alternate port (587?)
> setup if the spam service is able to connect to an alternate port.
> That way, the users can also change their configs to 587 and most
> spammers will be trying 25 which is closed.

Can't you just insist on SMTP AUTH?  Or  (crude but still just about usable)  
require a POP3 connection before allowing an SMTP connection?

-- 
AJS