Dyonisius (Dick) Visser: > hi guys > > I'm seeing a funny response from a remote Postifx server. > If I manually telnet to it, the SMTP banner comes in very slowly, one > letter at a time. > It looks like someone is manually responding :-) > > Is it a postfix feature that causes this behaviour?
To find out if a client is a spambot, I have tried several reply strategies including sendmail's greetpause and spamd's "stutter reply". Postfix uses a strategy that detects more spambots in less time. This is part of Postscreen, available in Postfix 2.8 and later. For early results, see http://www.postfix.org/postscreen-2010.pdf Wietse
