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.

SOBOO: Delegation with CNAMEs

By | Email Technology, Technical Guidance

Sending On Behalf Of Others: Sub-Domain Delegation With CNAMEs This article expands on the “CNAMEs” approach described in the larger How to send DMARC-compliant email on behalf of others article.  An assumption is that the reader is sending email on behalf of others, and desires to send such email in a manner compliant with DMARC.

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SOBOO: Full sub-domain delegation

By | Email Technology, Technical Guidance

Sending On Behalf Of Others: Full Sub-Domain Delegation This article expands on the “full delegation” approach described in the larger How to send DMARC-compliant email on behalf of others article.  An assumption is that the reader is sending email on behalf of others, and desires to send such email in a manner compliant with DMARC.

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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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