Hi,

Yes indeed. I had it so far 2 times when I send a mail to someone and I get an error back saying:

does not like recipient.
Remote host said: 550 host is listed in sbl.spamhaus.org

I found out they are http://www.spamhaus.org
Maye the reciever is using this prog but why am I on the list? Strange. Just thought I would share my experience. I use a @flyingpaper.com address.

Coder

Those blacklists are not Domain name based but IP based. Most likely this has happened cause your ISP has been having badly configure E-mail server (Open proxy). Spammers are notoriously active on misusing those proxies and one important way to limit spam is to eliminate it based on source address.

So complain to your ISP .. they soudl fix they systems and get of blacklist.