silently blocked by Hotmail?
In a cursory investigation, it appears that we cannot email any destination @hotmail.com UNLESS we do strange things like put in a "Re:" in the subject line and some evidence of a reply in the body, like:
-- In a message from Jan 30, 2004, Bob said: --
>> This is a real message
>> This is a real message
SMTP logs indicate successful delivery either way.