Folk,
This is like the insurance industry basing rates on auto make/model. While
that is one factor, the much more important factor is the driver. It's the
user, not the MTA, that 'spreads' viri. This problem is not limited to
AOL/MSNites. And if techies are so much better why are there compromised
IIS, Apache, FTP, etc. machines around months and often years after fix
releases?
To paraphrase someone you may be familiar with,
Be conservative in what you send and liberal in what you accept.
I'm much more interested in the message than the medium. 
-Al Rowland
Just my 2�, feel free to use your delete key."