Pricing

$3.00 / 1,000 domain checkeds

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SPF, DMARC & DKIM Checker (Bulk Domains)

Try for free

Audit email authentication for many domains: SPF, DMARC, DKIM, MX, MTA-STS and BIMI records, with an A-F grade and plain-English fixes.

Pricing

$3.00 / 1,000 domain checkeds

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0.0

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Proper Ecosystem Tools

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Monthly active users

9 hours ago

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SPF, DMARC & DKIM Checker (Bulk Email Authentication Audit)

Check email authentication for hundreds of domains at once. For each domain you get the SPF, DMARC, DKIM, MX, MTA-STS, and BIMI records, a simple A to F grade, and a plain-English list of what to fix. Useful since Google and Yahoo's bulk-sender rules require SPF, DKIM, and DMARC.

What it checks

SPF: present, single record, all qualifier (-all, ~all, ?all, +all), top-level DNS-lookup count vs. the 10-lookup limit
DMARC: policy (none / quarantine / reject), subdomain policy, pct, aggregate report address (rua)
DKIM: probes about 17 common selectors (google, selector1, selector2 for Microsoft 365, k1 for Mailchimp, s1/s2, and more) plus any you add
MX, nameservers, MTA-STS, and BIMI records

All lookups go through public DNS-over-HTTPS resolvers. Only public DNS data is read; nothing is sent to the domain.

Input

Field	Description
`domains`	Domains or URLs, one per line
`dkimSelectors`	Extra DKIM selectors to probe (optional)
`concurrency`	Domains in parallel (default 10)

Output (illustrative example, one item per domain)

{"domain": "example.com", "grade": "B", "score": 85,
 "issues": ["DMARC p=none only monitors; move to quarantine or reject"],
 "spf": {"present": true, "record": "v=spf1 include:_spf.google.com ~all", "allQualifier": "~all", "lookupTerms": 1},
 "dmarc": {"present": true, "policy": "none", "rua": "mailto:dmarc@example.com"},
 "dkim": {"selectorsFound": ["google"]}, "mxRecords": ["1 smtp.google.com"]}

Pricing

Pay per domain checked. Lookups that fail on a temporary DNS error come back free with an error field.

Use cases

Deliverability audits for agencies, lead qualification (domains with no DMARC are prospects for email security services), vendor security questionnaires, and monitoring your own domains on a schedule.

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