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
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Do you have any email filtering software?
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:

Also see:

They have a wizard for creating SPF records.

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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.

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