10 Oct
2017
10 Oct
'17
7:26 p.m.
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