=== InSpammerBlacklist

Checks the network IP address of the sending server against a blacklist of
spammers. There are 3 lists that support this...

* *blackholes.mail-abuse.org*: Rejected - see http://www.mail-abuse.org/rbl/
* *dialups.mail-abuse.org*: Dialup - see http://www.mail-abuse.org/dul/
* *relays.mail-abuse.org*: Open spam relay - see http://www.mail-abuse.org/rss/

Example:

....
<mailet match="InSpammerBlacklist=blackholes.mail-abuse.org." class="ToProcessor">
  <processor>spam</processor>
</mailet>
....