We've had similar spectacular results where I work (no pretty graphs to prove it though!). However, we're spending a fair bit of time on whitelisting, and on education along the lines of "no, email is not instantaneous and never has been". We're also having significant issues with some of our UK branches because we're not at work when they are and can't respond in a timely fashion to their whitelisting requirements when they arise, and in fact today we have caved in and have completely bypassed greylisting for all their incoming email. Note also that you need to whitelist Xtra and Google - neither of which appear in the published "standard" whitelist. (well, some of the many Google relays are listed, but they're commented out.) On Thu, 2006-11-16 at 11:28 +1300, Russell Fulton wrote:
Hi Folks, This might be of interest to NZNOG members -- we have just implemented grey listing for some addresses and the results have been dramatic to say the least...