Problem with mails from my exchange server

How do I get rid of this error from my exchange 2003 server?

550 5.7.1 Rejected due to Sender-ID policy for sender
John_JohnssonAsked:
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ryansotoCommented:
Do you have any email filtering software?
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imalc3142Commented:
You need to add SPF records to your domain's external DNS.  SPF is a text record that is  identifies you in the DNS world as valid domain.

See reference:

http://en.wikipedia.org/wiki/Sender_Policy_Framewor

Also see:

http://www.openspf.org/

They have a wizard for creating SPF records.
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isaman07Commented:
It means that you have The Sende ID filtering enabled. Launch ESM---> Global Setings--->Message delivery---->Sender ID filtering tab--->select either accept or delete.
Alternatively go to ESM---->servers--->yourservername---->protocolsoooo>smtp----->default smtp virtual server---->roght click---->properties---->advanced---->edit---->uncheck apply sende ID filter.


Harout
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