Re: Character by character SMTP banner?

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

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