If you're a spammer or host spammers, this list below is probably not good news. It seems
just about everyone these days has an opinion as to who they should refuse email from. If
you want to filter spam and SPEWS does not list enough, or is just not to your liking, one
or more of the following lists or systems may be able to help.
Make sure you know what you are getting into before using anyone's spam advisory list or
blocking/filtering system. Some are known to be much stricter than SPEWS and also note that,
unlike SPEWS, some will never remove network address ranges once spam has originated from
them. Spammers and spammer hosts should pay heed to this as well.