Don't /dev/null the spam, reject it. Unlike the procmail/qmail/posfix-ites you have the tools that enable you to "Do the right thing"(tm). With SA+milter+sendmail on your incoming gateway you can give an SMTP reject status to an attempt to hand you spam (or other nastygrams).
This is the right thing to do because:
(...)
In the case of real spam, unlike a 'bounce' or return to sender, the
reject will -not- send it to some innocent bystander but will leave the
spamhaus holding the bag of garbage.
This is not necessarily true.
If you receive mail through some relay server (for instance you are set up to receive mail through your ISP's server, or you have a backup mail server - spammers increasingly send mail to the secondary MX record), you may reject it, but this intermediate relay server will then have to bounce it. Usually to some innocent third-party. (Like me. I receive a few thousand such bounces per week.)
IMHO, in this day and age, bouncing/rejecting spam is definitely a bad idea.
- Michael
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