Sender Policy Framework

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Ubuntu Linux 7.04 (Feisty Fawn) Released With Support For SPF Checking - April 19, 2007

The newest release of the popular Ubuntu Linux distribution includes Perl and Python SPF libraries that are compliant with RFC 4408 and the SPF test suite. Also included are associated Postfix policy servers. Postfix is the preferred mail server for Ubuntu. This is mentioned in the New Feature Tour (in the mail server section).