#550 4.4.7 queue.expired message expired ## exchange 2007

I am getting the below error when I send email to any yahoo account from my exchange 2007 server. My Domain and exchange running in one server.

#550 4.4.7 queue.expired message expired ##
Who is Participating?
James HIT DirectorCommented:
Does this only happen to Yahoo? Does any other external recipient receive their email?
Can you validate your MX information is correct?

Verify your setup is correct using this tool.

Pete LongTechnical ConsultantCommented:
Can you resolve the DNS name of the organisation that is in that queue?
Pete LongTechnical ConsultantCommented:
And make sure you server identifies itself correctly
Pete LongTechnical ConsultantCommented:
And take a look here to make sure your DNS is configured correctly
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