Re: [44net] greylisting on mailman (this list)

Will,

The problem is that the large email purveyors like AOL, Yahoo, Microsoft, etc, use large server farms that balance the load between multiple hosts, so when the mail retries it comes from different IP addresses on every retry. Microsoft, for example, lists thousands of IP addresses as part of their email service.

Greylisting by IP address hasn't got a chance of working in that environment.

Thanks - Brian

On Tue, Oct 10, 2017 at 06:19:01PM -0500, Will Gwin wrote:

Brian,

Depending on the implementation you're using, you can tune the timers to hold valid hosts longer and enable learning without taking action for a while.

Will Gwin www.N5KH.org