TS2621 Cannot send emails from my iPad hotmail account.  I can receive but not send.  I get message"unable to send email"

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This just started out of the blue today.  I get a message saying email cannot be sent.  
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I have done everything in the link TechMastr suggested.  I can not send a hotmail message from any of my I-devices.  I thought it might be just my accounts, but tried my husband's device as well.  This includes things not connected to wi-fi and on 3G.  Could it be hotmail?  It is so frustrating.