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.

Policy Modes: Quarantine vs Reject

By | Deployment, Technical Guidance

Domain owners can publish policies that will be applied to email that is not compliant with DMARC: p=none is used to collect feedback and gain visibility into email streams without impacting existing flows. It’s a crucial first step. p=quarantine allows email receivers to treat email that fails the DMARC check as suspicious and files them…

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More Yahoo domains move to p=reject

By | Ecosystem News, Technical Guidance

Yahoo is placing ymail.com and rocketmail.com into p=reject on November 2nd. This information is being provided to give people and companies time to prepare, as the #1 piece of feedback from when Yahoo moved yahoo.com to a p=reject was that Yahoo didn’t let the Internet know about the move in advance. Hopefully, this announcement will…

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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.  More info at <this page!>. 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,…

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