Dear rr.com users:
Because of the amount of spam emanating from rr.com addresses, and rr.com's unwillingness to do anything about it (except occasionally to use up large amounts of bandwidth with "security sweeps"), I have banned rr.com from access to my website (and my email server too).
If this bothers you (it ought to), you can complain to security@rr.com and to the local office of your ISP. Or change ISP. That's what I'd do. When they have no customers left except the spammers, perhaps they'll be more eager to take up their responsibilities.
When I have received some kind of indication that rr.com is willing to take internet security and spam concerns seriously, I will remove the block.