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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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EffEffTee
Asked:
EffEffTee
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jfletchsterIT ManagerCommented:
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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EffEffTeeAuthor Commented:
I manage DNS internally.  

Would it make any difference if we were using a smart host?
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jfletchsterIT ManagerCommented:
Well the smart host needs to be allowed to send emails on your behalf which is what the SPF states.
SPF records are added using a TXT record. If you have a look at the website i have linked you will be able to choose the record you need.

http://old.openspf.org/dns.html?mydomain=example.co.uk&deny=softdeny
Look under the section;
"If other machines in the domain also send mail, designate them."
"If any other machines not in the domain also send mail from that domain, designate them."
"Each of your mail servers should have an SPF record also."
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