Cannot send mail. Receiving is no problem

When I send mail I get the message :Cannot send Mail. The sender address was invalid. Then it says 1 unsent message.
All accounts work with office and have been updated with iTunes. What is wrong?
Thanks and regards

I am having the same problem with my POP mail. I receive but cannot send. It always say's "invalid address" but I can send with hotmail. I think it is an smtp problem but I cannot solve. Anyone have an idea?

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