Sender Policy Framework

Best Practices

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Best practices

Publishing SPF

Combine a strict policy with authenticated SMTP

Checking SPF

Common Mistakes (aka stupid SPF tricks)

Only border MTAs can directly check SPF
SPF checks must account for forwarding

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Sender Policy Framework

Best Practices

Publishing SPF

Checking SPF

Common Mistakes (aka stupid SPF tricks)

The SPF Project

Documentation

Support