[Greylist-users] Exchange & Greylisting

William Blunn bill--greylist at blunn.org
Thu Dec 15 09:04:42 PST 2005

Brent Meshier wrote:
> Has any work been done to bring greylisting to Microsoft Exchange?
> I've been running greylisting on both sendmail and qmail for the last 
> few years and I can't imagine life without it. Within the next month 
> we will be migrating our mail to Exchange.. SBS 2003 specifically. If 
> there is a solution already out there I'd like to know, otherwise I'll 
> go brush up on my VB scripting and get to work.

There is a already a solution. Interpose a Linux box between the outside
world and your Microsoft-OS'd machine.

For a start you can then isolate your vulnerability-prone Microsoft box
from the big bad Internet.

You can then run a greylisting mail relay on the Linux box, and then
pass on any good stuff to the Microsoft box.

You might as well treat the Linux machine as a green field installation
and install a proper MTA like Exim4.

To pick at random one of the many many advantages of Exim4 over
Sendmail: With Exim4 you can set up a bunch of rules which examine the
HELO parameter and do various sanity checks. This can kick out heaps of
spam with very little machine resource. Enhydris Lutra.


More information about the Greylist-users mailing list