Verify your SPF, DKIM, and DMARC in seconds. Prevent domain impersonation, fix delivery issues across Google & Microsoft, and reach p=reject safely.
Strict Enforcement
Attackers cannot impersonate or spoof this domain in customer inboxes.
Healthy DNS Budget
Well under the RFC 7208 10-query limit. Zero risk of SPF PermError.
Cryptographically Aligned
All outbound vendor mail is signed with RSA-SHA256 and aligned.
2026 Mailbox Mandate Ready
Meets Google, Yahoo, and Microsoft strict bulk sender requirements.
Works seamlessly across leading corporate email & DNS networks
Why legitimate transactional emails bounce when companies configure DMARC blindly, and how our out-of-band engine eliminates each failure mode deterministically.
Every SaaS vendor adds nested DNS queries (include:). When total lookups reach 11, RFC 7208 mandates a fatal PermError. Receiving mailboxes drop or spam-filter legitimate invoices.
DmarcLock resolved nested includes into dedicated IP netblocks. Lookup count is 1.
acme.com. IN TXT "v=spf1 ip4:198.51.100.0/24 ip4:203.0.113.0/24 ip4:192.0.2.0/24 ~all"Stop clicking through legacy DNS consoles. Declare your email authentication rules alongside your application code with our Terraform provider, REST API, or CLI gate.
Block pull requests that add third-party email vendors without DKIM key delegation or SPF flattening.
Syncs dynamically with Cloudflare, AWS Route 53, NS1, and Google Cloud DNS via webhooks or Terraform.
# Inspect corporate domain policy & SPF depth via REST API
curl -s -X POST https://api.dmarclock.com/v1/inspect \
-H "Authorization: Bearer dlk_live_7e8b91c4..." \
-H "Content-Type: application/json" \
-d '{
"domain": "acme.com",
"require_dkim_alignment": true,
"max_spf_lookups": 10
}' | jq .readinessA phased architectural progression governed by automated cryptographic verification gates. Advance with mathematical confidence that invoices, receipts, and resets never drop.
Your domain begins in passive observation mode. Receiving MTAs (Google, Microsoft, Yahoo) transmit daily compressed RUA reports. DmarcLock parses and classifies 100% of outbound volume into legitimate transactional relays, marketing vendors, and rogue spoofers.
Verification Gate Checklist
Enterprise infrastructure software requires unambiguous security demarcations. Here is our exact architectural scope versus your untouched mail systems.
Publishes authoritative DMARC policies (p=reject), autonomous SPF CIDR flattening, and branded DKIM selectors.
MX records stay 100% intact. We never proxy outbound mail, never introduce SMTP hops, and add exactly 0ms delivery latency.
Ingests compressed daily XML reports (source IP, sending domain, pass/fail counts). Zero message bodies or subjects parsed.
Subject lines, body text, attachments, and customer email addresses never cross our boundary. Zero GDPR, HIPAA, or SOC2 scope expansion.
Automated sync for _dmarc, _spf, and selector CNAME records via Cloudflare, Route 53, or manual TXT copy.
We never take over root nameservers (NS), never alter A/AAAA apex records, and cannot modify unauthorized zone entries.
Watchdog monitors SPF lookup depth and DMARC record tampering 24/7, alerting your team via Slack/Teams.
User inboxes, OAuth credentials, calendar data, and tenant admin accounts remain completely untouched and unpermissioned.
Legacy enterprise vendors built their businesses on proxying email traffic: routing corporate mail through their servers, adding latency, creating single points of failure, and charging exorbitant fees every time your company sends a marketing newsletter or billing receipt.
That architecture is fundamentally flawed. When an inline mail proxy goes down, business stops. When a proprietary black-box score hallucinates, legitimate customer invoices bounce.
We built DmarcLock around three immutable protocol invariants:
We never touch MX records. Telemetry is parsed via asynchronous RFC 7489 RUA XML reports. Exactly 0ms added delivery latency.
Strict adherence to RFC 7489, RFC 7208, and RFC 6376. Automated CIDR compilation guarantees you never exceed the 10-query SPF limit.
We never allow a domain to advance to p=reject until mathematical proof confirms that 100% of legitimate sending services pass alignment.
Unlike legacy enterprise vendors that charge more as your email volume grows, DmarcLock offers flat-rate domain protection with zero volume penalty.
For engineering teams protecting core production domains.
For IT consultants & managed service providers managing client domains.
For large MSPs, consultancies, & enterprise security operations.
Managing high-volume sending or a large client portfolio?
See exactly how much you save vs. legacy metered vendors ($2,000 to $12,000+/year) with our live slider.
Clear answers on DMARC enforcement, SPF flattening, and protecting email deliverability.
DmarcLock (dmarclock.com) is an enterprise email security and DMARC enforcement software platform. It enables organizations to protect their domain names from email spoofing, phishing, and impersonation by guiding them safely from passive monitoring (p=none) to verified policy enforcement (p=reject). DmarcLock continuously ingests aggregate XML reports from Google, Microsoft, and Yahoo, verifies third-party sending services (such as SendGrid, Stripe, and Google Workspace), and eliminates SPF PermErrors using recursive DNS flattening under RFC 7208.
Run an instant authoritative DNS audit. Discover nested SPF lookup overflows, missing third-party DKIM keys, and subdomain policy gaps in seconds.