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I´m guetting an error 421 5.5.0 whem sending messages  from an exchange2007

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I´m guetting an error 421 5.5.0 whem sending messages  from an exchange2007 to a exchange 2003 behind a ISA2004, In the ex2003 side i´m able to receive mail from others exchange´s 2007 , any clue?
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Subash SundharanIT Infrastructure Architect
CERTIFIED EXPERT

Commented:
Can you paste the full NDR message?

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Commented:
Because I had to change some DNS configurations
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