Policy level
p=none monitors, quarantine sends suspicious mail to spam, and reject blocks failing messages.
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Inspect your DMARC policy, reporting destinations and enforcement level.
DMARC tells receivers how to handle messages that fail SPF or DKIM and where to send authentication reports.
Start with monitoring, review reports, then move toward quarantine or reject when legitimate senders are aligned.
Three signals that matter most when interpreting this tool.
p=none monitors, quarantine sends suspicious mail to spam, and reject blocks failing messages.
DMARC passes when aligned SPF or DKIM authenticates the same organizational domain.
rua and ruf tags identify where aggregate or forensic reports should be delivered.
DMARC connects SPF and DKIM to the domain visible in the From header. It also provides aggregate reporting, giving domain owners a view of legitimate and unauthorized sending sources before enforcement is increased.
Begin with p=none and a monitored aggregate-report address. Correct alignment for real senders, then move gradually to quarantine and reject. Subdomain policy, percentage rollout and strict or relaxed alignment can be adjusted for complex organizations.
Email authentication works as a system rather than as isolated records. SPF identifies permitted senders, DKIM proves message integrity and DMARC evaluates alignment against the visible From domain. A technically valid record can still produce poor deliverability if another part of the authentication chain is incomplete.
Use this tool before and after adding a mail platform, CRM, billing application or marketing sender. Keep a record of every authorized source and remove obsolete services so your domain policy stays understandable.
Found a configuration problem or planning your next deployment? These HostGraber services are the most relevant next steps for this tool.
Provide the domain, IP address, workload, server specification or calculator inputs requested by the tool.
HostGraber validates the input and processes the request using the appropriate DNS, network, SSL or calculation logic.
Review the output, copy it when needed, compare related checks and use the linked HostGraber resources for the next step.
Clear answers for common dmarc checker questions.
Usually start with p=none, review legitimate senders, then increase enforcement gradually.
No. DMARC passes when either SPF or DKIM both passes and aligns with the visible From domain.
The pct tag controls the percentage of failing messages to which the enforcement policy is applied.
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