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文件: /usr/share/doc/postfix-3.4.7/examples/smtpd-policy/README.SPF
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See http://www.openspf.org/Software for the current version of the SPF policy daemon for Postfix. SPF support is also available via MILTER plugins, such as sid-milter at http://sourceforge.net/projects/sid-milter/ which implements both SenderID and SPF.
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