a.com mx10 can not send to b.com (goole mx)

Did you uncheck the box for b.com when you changed the MX records?
 
Without knowing the real domain names and the IP#s they're supposed to work at, there'd be nothing we could use to help you without guesswork. Personally I don't believe in guesswork, though it's always possible someone else may, and respond.

Jeff
 
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