From: Deepak Jain (no email)
Date: Wed Aug 26 2009 - 16:09:30 EDT
> Now, did you want that in terms of "number of copies installed" or
> "amount of mail handled"? There's probably zillions of little Fedora
> Ubuntu boxes running whatever MTA came off the disk that are handling 1
> or 2 pieces of mail a day, and then there's whatever backends are used
> by MSN/Hotmail, Yahoo, AOL, etc. "This MTA packed by weight, not by
> Some settling of contents may have occurred during shipping and
> (Seriously - if 95% of the mail out there is spam, then the top 4-5
> MTAs are probably the ratware that's sending out the spam. Something
> to consider...)
In keeping with this concept, and turning it around. What MTA is exposed to the most spam? (1-x) That should tell you what MTA handles the most "good" mail by also being the destination for the most spam (good, live recipients).
Or I could be missing something well known about mail flows.