o...@field.hu:
> I totally agree with you guys, SASL auth is already implemented, BUT... 
> there are a couple thousand mailboxes and part of them have weak 
> password as it turned out. Spam bots finds out the password and spam the 
> world from my server. It never happened with pop-before-smtp (imap is 
> also working with pop before smtp just to know :). I installed fail2ban, 
> but spam bots come from different IPs every time. SASL was implemented a 
> week ago, 3 spam flood happened since then... any idea how to avoid it?

See RELEASE NOTES.
See http://www.postfix.org/postconf.5.html#smtpd_relay_restrictions

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