Alan Premselaar schreef (08-12-06 3:06):

if you're blocking their POP3 access, how are those users ever supposed to receive that mail notification?

That's simple: i am blocking them on username. Example: I am blocking johndoe's pop3 session. In Postfix I forward all mail for johndoe to johndoe@another.email.adress.com So johndoe can still receive mail.

Also, what if it's a brute force bot or something trying to access a random blocked account via POP3? (alright, not as likely, but still possible)

There you've got a point...

a more suitable solution would be if there was a way to return an error during the authentication process that was returned as a result of trying to authenticate to a blocked user.

The text I am sending could be any text, from 'your pop3 box = blocked' to '<any errornumber> on your POP3 box'

Jos