Sender Policy Framework

Integrate SPF with other email authentication technologies

SPF is one tool for supporting domain level authentication of email. Newer technologies like DKIM complement SPF. There is now DMARC to support integrated assessment of both SPF and DKIM by many of the largest mailbox providers like Yahoo! and Google and provide feedback on the status of emails received for your domain. This is a great step forward to provide a reliable method to answer the long standing question of "How do I test my SPF record". The DMARC project has a select of useful resources for learning about, and deploying, DMARC.