>a mystery...
 >
 >Are you using our LSMTP mailer?  If so, please try site-specific logging of
 >email.msn.com to see what is happening in the SMTP transaction.  See the
 >LSMTP-FAQ for more info:  http://www.lsoft.com/manuals/lsmtp-faq.stm#2.6
End Reply

Another interesting "thing" is that mail to @email.msn.com is "handled"
by ten different MX hosts, which does not appear to be the same list as
to @msn.com.

/Pete