An SPF record is a type of Domain Name Service (DNS) record that identifies which mail servers are permitted to send email on behalf of your domain.SPF is an open standard created to stop forgery of From addresses. SPF helps mail servers distinguish forgeries from real mail by making it possible for a domain owner to say, "I only send mail from these machines". That way, if any other machines try to send mail from that domain, the mail server knows that the From address is forged.
Creating SPF records
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You can create the spf records for the domains from this link :
http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/
Checking SPF records for a Domain
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You can check if a Domain have valid SPF record via :
http://mxtoolbox.com/spf.aspx
Performing a Dig search :
Dig +trace Domain name txt
Will display a result like : v=spf1 include:spf.intermedia.net ~all or
v=spf1 A:my_smtp_server_name include:spf.intermedia.net ~all
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