Playing games with spammers is fun. You could always do something like this:
DNS records:
fake.hostname.example.com. IN MX 10 tarbaby.junkemailfilter.com.
MX 20 mail.example.invalid.
MX 30 localhost.
MX 40 @ ;itself.
MX 50 mx.fakemx.net.
A 0.0.0.0 ;any non-routable.
AAAA 2001:DB8::1 ;any non-routable.
SPF "v=spf1 -all" ;never a sender.
localhost. IN AAAA ::1
A 127.0.0.1
SPF "v=spf1 a -all"
All but the #2 MX resolve. The first and last are trap hostnames that always
reject (but log the sender). Some spammers skip the first and/or last MX
entries. The fourth generates timeout delays or "no route to host" errors. If
the spammer can resolve "localhost" (the third) and accept the mail for relay,
this could catch the spam in a loop on the spammer's machine (at least until a
"Received:" header loop detector catches it). "Sit and spin" is a good result
for a spammer. Delivery only occurs with "localhost."
As for the original question, send the spammer a mailbox redirection to a
mailbox under your fake hostname and let them sit and spin. ;-)
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