DMARC Record Generator
Build a valid DMARC TXT record with the right policy, reporting, and alignment settings. All generation runs in your browser -- nothing is sent to our servers.
What is DMARC?
DMARC (Domain-based Message Authentication, Reporting and Conformance) is an email authentication protocol defined in RFC 9989. It builds on SPF and DKIM by adding a policy layer: domain owners publish a DNS TXT record at _dmarc.example.com that tells receiving mail servers what to do when a message fails both SPF and DKIM alignment checks.
A DMARC record starts with v=DMARC1 followed by a semicolon-separated list of tags. The two required elements are the version tag and the policy (p=). Everything else is optional but strongly recommended -- especially the rua tag, which specifies where to send aggregate reports so you can monitor authentication results.
Organizations typically start with p=none to gather data, then gradually tighten to quarantine and finally reject as they confirm all legitimate senders pass authentication. The pct tag lets you apply the policy to a percentage of failing messages during rollout.
DMARC Tag Reference
| Tag | Required | Description |
|---|---|---|
v | Yes | Version. Must be DMARC1 and must be the first tag. |
p | Yes | Domain policy: none, quarantine, or reject. |
sp | No | Subdomain policy. Inherits from p if absent. |
rua | No | Aggregate report URI(s) for daily XML reports. |
ruf | No | Forensic report URI(s) for per-message failure reports. |
adkim | No | DKIM alignment: r (relaxed) or s (strict). |
aspf | No | SPF alignment: r (relaxed) or s (strict). |
pct | No | Percentage of failing messages the policy applies to (0-100). |
fo | No | Failure reporting options: 0 (all fail), 1 (any fail), d (DKIM), s (SPF). |
ri | No | Requested aggregate report interval in seconds (default 86400). |
Read the complete DMARC guide to learn more.
Get the full picture with DMARCguard
Continuous monitoring, aggregate report parsing, and actionable insights for all your email authentication protocols.
Start Free