Normally I get only a handful of spam e-mails per day -- greylisting is that effective at keeping most of them out. But over the past couple of days, this moved closer to being a flood like the bad old days, with several dozen coming in over the last 24 hours or so. Doing a quick check, all the ones I looked at were being sent from *.cyou domains. Yes, there really is such a top-level domain now. But given that it seems to be used entirely for spam, it’s easy enough to add a line to my block_sender file: /^.+(a).+\.cyou$/ REJECT