Wietse Venema:
> Steve Fatula:
> > Yes, I do realize the more added to postscreen, the slower it gets,
> > etc. However, one function that would seem to fit perfectly if
> > it's not too slow would be spf and dkim checks. SPF we are doing
>
> Postscreen by design NEVER SEES THE ENVELOPE OR CONTENT of email
> that is received by Postfix.
To clarify, postscreen attempts to answer one question:
- Is the client a spambot?
Postscreen is not concerned with this question:
- Is this email message spam?
Each approach has its merits, but the first one can eliminate most
spam with the least effort, given that ~90% of email is spam, and
that ~90% of spam is sent from botnets. Deciding if message is
spam is much more difficult.
Wietse
> DKIM, on the other hand, requires computing a digital hash over the
> header and body content.
>
> Wietse
>
