An unpublished bit of information that I ran into a year or so ago is that with a free Hotmail account sending 10 messages in the same day - or the same message to 10 or more people - triggers a 24-hour block on your sent mail. The "rule" is not too consistently enforced, but can be a real surprise if you've done it once with no problem and the next time they turn you off - without explanation.

Since the only way to get support for your Hotmail account is to send them an email, if your send connection is blocked the technical term for your condition is S.O.L., I think.

(You can pay extra to have that limit removed.)

John