I am not sure just what Bluegrass Net does to stop spam, but the last I was told is that they blocked mail coming from any server on a list of open relays.
I've had legitimate correspondents, both direct and through lists, with Hotmail or Yahoo addresses, and I wouldn't want to bar those. It is highly unusual that I receive a spam from a legit Hotmail or Yahoo address, though I receive a lot of spam from faked Hotmail and Yahoo addresses. Anybody can call themselves [EMAIL PROTECTED], and if Hotmail addresses are barred, they can change that to [EMAIL PROTECTED] I see some Korean spammers apparently using that logic to change dreamwiz.com to dreawiz.com, though I don't think Bluegrass Net has any filters against Korean spam domains. Majority of spams I receive are Korean, almost all in HTML, and I don't try to read them. Usually the subject line contains a bunch of upper-ASCII characters that make no sense. I rarely get anything from .ru or .cn domain, though I get Chinese spams from .tw domain. I wouldn't want to block entire domains when many of the users are legit, and wouldn't want to block an entire nationality.
