Technical Guidance

This is a selection of our blog content that includes useful articles on understanding, deploying and managing DMARC, SPF, DKIM and related technologies.

PTR mechanisms in SPF records

By | Email Technology, Technical Guidance

If PTR mechanisms are detected, the current diagnostic output is: Warning: PTR mechanisms SHOULD NOT be used and cannot be resolved using this diagnostic tool. What does the PTR mechanism mean?  When an email receiver gets a piece of email and the PTR mechanism is in the sender’s SPF record, the receiver will look at…

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