DMARC Domain-based Message Authentication Reporting and Conformance

Summary & Resources

Domain-based Message Authentication Reporting and Conformance (DMARC) is a method of authenticating email messages. A DMARC policy tells a receiving email server what to do after checking a domain's Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) records, which are additional email authentication methods.

• DNS DMARC record summary - Cloudflare
• DMARC org
• Email Spoof Test

How it works

Settings up a DNS record for DMARC with all rejects. multiple types of content text provided

Type: TXT
Name: _dmarc
Content: "v=DMARC1; p=reject; pct=100"
Content: "v=DMARC1; p=reject; pct=100; adkim=s; aspf=s"
Content: "v=DMARC1; p=reject; pct=100; adkim=s; fo=1; aspf=s; rua=mailto:report@mydomain.com,mailto:report@xyz.com"