DMARC Tool

A DMARC configuration tool for domain owners and security teams to generate correct DMARC DNS records and validate policy, alignment, and reporting settings.

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About This Tool

The DMARC Tool generates a domain DMARC DNS TXT record from structured inputs. Users supply domain, policy (none, quarantine, reject), and optional subdomain policy (sp). The tool validates basic syntax, enforces RFC 7489 compatibility, and flags obvious conflicts such as SPF and DKIM misalignment indicators. It does not perform live DNS queries; it only builds the record and offers export-ready strings.
Inputs include reporting endpoints rua and ruf as mailto: URIs, alignment modes adkim and aspf (r or s), and percent, pct. The engine applies defaults when values are omitted (adkim=relaxed, aspf=relaxed, pct=100). The resulting DMARC record is a single DNS TXT value starting with v=DMARC1; p=…; and optional tags. Advanced users can include fo, rua, ruf, and sp.
Outputs provide the final TXT record and a recommended deployment plan. The tool highlights potential issues, such as missing reporting endpoints, overly long inputs, or subdomain policy conflicts. It can export to DNS zone formats or copy-ready strings to paste into DNS management systems.
Who benefits: domain owners, security teams, MSPs, and IT admins. Use cases include onboarding a new domain, tightening policy during phishing incidents, and quarterly DMARC reviews to verify policy correctness and reporting setup.

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How to Use

Provide inputs: domain, policy, adkim/aspf, rua/ruf, pct, and sp if applicable.
Review defaults for any omitted advanced settings.
Click to generate the DMARC TXT record and recommended settings.
Copy the DNS TXT value and publish under _dmarc.yourdomain.
Validate syntax and monitor reports from rua/ruf addresses.

Frequently Asked Questions

Find Quick Answers

What is DMARC and why use this tool?

DMARC combines SPF and DKIM to authenticate email, and publishes a policy for receivers to follow. This tool helps generate a correct DMARC TXT record, configure reporting endpoints, and validate alignment settings without performing DNS lookups.

Do I need rua and ruf reporting addresses?

RUA is for aggregate reports and RUF for forensic reports. They help you monitor mail flows and issues. You can omit them, but including valid mailto: URIs improves visibility and incident response.

Can I configure subdomain policy (sp)?

Yes. The tool supports sp to define a policy for subdomains, which can differ from the apex domain policy. This helps manage DMARC behavior across a domain suite.

Does the tool perform live DNS checks?

No. The tool generates and validates the DMARC string and syntax, but does not perform live DNS queries or verify DNS TXT record existence. Deploy in DNS management after review.

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