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Exchange 2003 SP2, SPF issue when sending mail

Hello

I get this error when sending to one particular recipient (thousands of others work fine!!)

#5.5.0 smtp;550 Your email was rejected due to an SPF issue. Either your SPF is validating that you are sending from an un-authorised SMTP server or your SPF record is corrupt (#5.7.1)

I read somewhere that it could be the PTR records in DNS being incorrectly configured, but I'm not sure if this is the case.

any ideas?

thanks,
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jfletchster
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You need to check the DNS config of your sending domain, if you manage this on your own servers or with a 3rd party hosting company. In the case of a 3rd party hosting company then they should give you an option in your DNS management to configure SPF records.
Some Spam filters require fully valid SPF records associated to a domain.
Use this website to generate a SPF record that is valid
http://old.openspf.org/wizard.html
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ASKER

I manage DNS internally.  

Would it make any difference if we were using a smart host?
ASKER CERTIFIED SOLUTION
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jfletchster
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