hotmail false error message

  Newuser3477 14:27 06 May 08

From time to time hotmail tells me that it has not been able to deliver an email from me to a friend that I know has received the message.. This occurs only for emails which I have forwarded ( from a number of different sources) The email from hotmail arrives just after an email from my friend tellimg me that the message has been received OK
Any idea what is going on because I can't trust the system as it stands at the moment

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