Questions tagged [dmarc]

DMARC (Domain-based Message Authentication, Reporting and Conformance) is an email authentication protocol. It is designed to give email domain owners the ability to protect their domain from unauthorized use, commonly known as email spoofing.

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How to set header.from?

A client recently received an email that was spoofed in a way that I'd never seen before. The following are the anonymised, relevant details from the email's headers: authentication-results: spf=none ...
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What does a failed SPF record tell me from a DMARC Aggregate report?

I just started receiving DMARC aggregate reports. I am trying to understand what it means for a Source IP to fail SPF. Does this mean that the domain that failed the SPF tried to send an email on ...
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DMARC and SPF are setup for my non-www domain but doesn't work for www

My website is up and running on www.example.com and I am sending automated emails from my email address support@example.com. DMARC and SPF seem to setup accordingly: _dmarc : v=DMARC1;p=none;pct=100;...
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Where can I find sample DMARC failure reports?

I want to automate ingestion of DMARC failure reports, both aggregate and forensic. Unfortunately, I don't have a mailbox set up to collect them yet. Does anyone know where I can find sample DMARC ...