rcp error won't let me send e-mail

  bitstream 16:48 08 Oct 08

when trying to send an e-mail i got the following error message:
"An error occurred while sending mail. The mail server responded: sorry, that domain isn't on my list of rcphosts (#5.7.1). Please check the message recipients and try again."
Never had this before, what does it mean and what can I do?

  MAT ALAN 18:47 08 Oct 08

click here

this may help...

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