Exchange Server Toolbox
Question / Problem
I’m quite satisfied with the spam recognition provided by the Exchange Server Toolbox. Nevertheless I have to accept every spam mail for recognition an training purposes – which creates some traffic, given the huge amount of spam floating around. Wouldn’t it be better, if we could use grey listing in the Toolbox?
Answer / Solution
Grey listing seems to work on first glance, but actually it’s efficiency is declining. On one hand, many spammer have adapted, esp. spam bots can circumvent grey listing by multiple delivery attempts. On the other hand will grey listing increase the traffic, enlarge delivery times and cut down delivery dependency. So, most experts advice on NOT using grey listing, because it produces more trouble than it prevents. Best way for disburdening the internet from spam is to throw it away after acception.