Resurse
- http://rbls.org/
- http://www.mail-abuse.com/
- http://www.lug.ro
- http://www.postfix.org/uce.html
- http://www.dnsbl.org/
- http://openrbl.org/
- http://www.robtex.com/rbl/
- http://cr.yp.to/ucspi-tcp/rblsmtpd.html
- http://www.sendmail.org/m4/anti_spam.html
- http://www.exim.org/howto/rbl.html
- http://www.xmailserver.org/Readme.html
- http://www.yrex.com/spam/spamconfig.php