Solve : Outlook 2003- recipient(s) could not be reached:?

1.	Solve : Outlook 2003- recipient(s) could not be reached:?
Answer» With each email I send I GET a SYSTEM administrator back, with this report as if it didn't send properly? Any ideas? 553 sorry, that domain isn't in my list of ALLOWED rcpthosts (#5.7.1) Still hoping SOMEONE will REPLY :}

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