Email security
What is DMARC?
Short answer: DMARC is a DNS record that tells mail servers what to do with email that pretends to come from your domain but fails SPF and DKIM checks.
The full answer
DMARC stands for Domain-based Message Authentication, Reporting and Conformance. It builds on SPF and DKIM: if a message fails both, your DMARC policy says whether to deliver it anyway, send it to spam, or reject it.
It also asks mail providers to send you reports showing who is sending email using your domain name, so you can spot forgery and forgotten services.
Without DMARC, anyone can send emails that look like they come from you, and big providers like Gmail and Yahoo now expect bulk senders to have one.
v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com
Want step-by-step help? Read What Is DMARC? A Beginner’s Guide to DMARC Policies.