bl.spamcop.net.
SpamCop cause me more issues and waste more of my time than spammers themselves; mainly because of the number of people who blindly send mail they claim is spam there but is often from something like a mailing list they've signed up to. Oh, and the tendency to occasionally decide the reporting machine is actually the spamming machine. Really not impressed with them.
We had bad experiences from spamcop at university. Someone must have forwarded a message to them that appeared to have come from someone at a friend's domain, and they blindly added the domain to their blacklist. so when he tried to send lecturers e-mail, he got it returned, very helpful.
The RBLs I hate are the ones that add all dial-in/dynamic IPs just because 'they must be spammers if they run an SMTP server'. I have an smtp server so my apache/php setup doesn't complain, it runs a couple of domains through dyndns, but whenever I send mail now they get returned because the majority of subnets my ISP own have been added, and according to the RBL websites "if we retest the IP and it is a dynamic IP we WILL NOT REMOVE IT", it even stops me sending mail through my hosting company's smtp server direct from mail clients :o(
Duncan Sample