Update
Check out my RRdtool graphs for qpsmtpd!
I thought I’d display some statistics on how qpsmtpd has performed in the last week.

Surely, adding the contents of me to the HELO hosts that aren’t allowed stopped a considerable amount of spam. Whether the same is true for localhost or whether those are misconfigured hosts trying to send legit e-mail is open for discussion.
I’m not using SPF yet as the required perl module was a bit of a hassle to install.
SpamAssassin is also quite effective as you can see, even though the Bayeisan filter isn’t in effect yet — it’s only had about 50 spam e-mails to train on so far, and the module won’t come into effect until it’s received 200. Of those 50 spam e-mails, about 30 were e-mails that were so spammy that spamd auto-learned them, 10 were spam messages I actually received, and 20 were from the junk I got on the previous server. I’ve had no ham that got scores of more than 5.0 (my munge_headers threshold), although some may have had a score over 10, in which case they were denied.
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