Mail sent locally is whacked

I host the site DomainA.com on Server A. The email for it goes to Server B. However then I try to send out mail locally from within Server A to email@DomainA.com, it keeps telling me the user is unknown.

The problem is, the email account is NOT supposed to be on Server A, but on Server B. What could be causing the machine to do this and how do I fix it?

 

 

 

 

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