Rainer Duffner wrote:
http://cr.yp.to/surveys/smtpsoftware6.txt That's from 2001.
It would be a fun project to try to do that again, though.
The biggest challenge will probably be to get a representative sample of domains and MXs
That would be a fun script to write. See what mail server *sent* to your mail server based on the headers and get a sampling that way.
I'll mull this over and see how I might implement this, since our mail server handles over 400K messages a day, it should give us a good idea of what ISP's are using.