The idea is to let the mail server which receive 3rd parties email to check the DNS of the domain name.. Find the SPF record ( TXT record for v=spf1 ) , and verify the IP or domain of the sender to see if it is allowed to send the email for such domain or not ..
Online resource
http://www.openspf.org/
Checking Tools
1. http://www.kitterman.com/spf/validate.html
2. http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/default.aspx
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