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On Mon, Mar 12, 2007 at 09:02:00AM -0400, Chris Wolf wrote: Since the greylisting went into effect last Wednesday morning, I have not received a single spam message, either marked or unmarked, through my mail.msu.edu account. Prior to the change I was getting five or ten per day, so I would have expected 25 to 50 during those five days. My MSU mail is forwarded to an Exchange server, where Microsoft's IMF filters out the most obvious spam so it doesn't even reach my mailboxes. I suspect that without this additional filtering I would still be getting some spam from my MSU account, but the improvement from the greylisting is still pretty impressive. (During this period I did get a single spam message addressed directly to my Exchange mailbox, which of course is unaffected by the greylisting.) Are others also seeing a dramatic improvement? I used to get around 150 spam/day forwarded from my msu.edu account. Fortunately my local Spamassassin has been catching over 99% of it. Between the announced greylisting start and Wed, 07 Mar 2007 21:00:30 -0500, I received a few dozen spam from msu.edu per day. Since then, I have only been receiving 2-3 per day. If this keeps up it will be a great improvement since there is only so much you can do when mail is forwarded. It is hard to draw some conclusions about system load during break changes, but it would be interesting to see if this brings a noticable processing decrease on the MSU mail systems over the next few days or weeks.