What is DMARC?
Domain-based Message Authentication, reporting and Conformance (DMARC), is a scalable mechanism that allows mail-originating organizations to express their domain-level policies and preferences regarding message validation, disposition, and report. This can be used by mail-receiving organizations to improve mail handling.
DMARC and the Email Authentication Process
How Senders Deploy DMARC in 5-Easy Steps ?
DMARC has been designed based on real-world experience by some of the world’s largest email senders and receivers deploying SPF and DKIM. The specification takes into account the fact that it is nearly impossible for an organization to flip a switch to production. There are a number of built-in methods for “throttling” the DMARC processing so that all parties can ease into full deployment over time.
- Deploy DKIM & SPF. You have to cover the basics, first.
- Ensure that your mailers are correctly aligning the appropriate identifiers.
- Publish a DMARC record with the “none” flag set for the policies, which requests data reports.
- Analyze the data and modify your mail streams as appropriate.
- Modify your DMARC policy flags from “none” to “quarantine” to “reject” as you gain experience.