Doesn’t your ISP offer a “whitelist” option to allow certain email through? You don’t say which provider is using Spamcop, although ATT is apparently a big user.
Spamcop themselves say: “The SCBL is aggressive and often errs on the side of blocking mail. When implementing the SCBL, provide users with the information about how the SCBL and your mail system filter their email. Ideally, they should have a choice of filtering options.”