The only free combined deliverability scanner

CHECK YOUR COMPLETE
EMAIL DELIVERABILITY Decorative underline IN ONE SCAN

MX + SPF + DKIM + DMARC - all four checks at once.

Most tools only check one protocol at a time. DMARCFlow runs a full deliverability audit simultaneously and gives you a single actionable score - for free.

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No account required. Results in under 10 seconds.

MX Records
MX Records

Mail exchange servers, priority, redundancy & reachability

SPF
SPF

Authorized sending servers, lookup limits & syntax validation

DKIM
DKIM

Cryptographic signing, key validation & selector discovery

DMARC
DMARC

Policy enforcement, alignment, reporting & subdomain coverage

Your Emails Are Fighting
an Invisible Battle

Every email you send is evaluated against dozens of criteria before it reaches an inbox. A single misconfiguration - a missing DKIM signature, a broken SPF record, no DMARC policy - can send your carefully crafted emails straight to spam. Or nowhere at all.

Inbox placement Over 20% of legitimate business email never reaches the inbox - authentication failures are the primary cause
Spoofing Without DMARC, anyone can send email pretending to be you - damaging your brand and tricking your customers
Reputation Checking only one protocol at a time misses the interactions - a broken link anywhere in the chain hurts the whole

How the Deliverability Score Is Calculated

  • MX Valid MX records with redundancy and reachable servers. Missing or misconfigured MX records immediately lower the score significantly.
  • SPF A syntactically valid SPF record covering your sending infrastructure. Absent or broken SPF records are a common cause of spam filtering.
  • DKIM A discoverable DKIM signing key for your domain. DKIM is the most forwarding-proof authentication method and is strongly weighted.
  • DMARC A DMARC policy at p=quarantine or p=reject earns the highest score. p=none scores partially. No DMARC record means no protection from spoofing.

Why DMARCFlow's Deliverability Checker
Is Different From Every Other Free Tool

One scan. Four protocols. One actionable score. No account required.

Combined scan
4-in-1 Combined Scan
  • checkMX, SPF, DKIM, and DMARC checked in a single request
  • checkNo need to run four separate tools
  • checkResults in under 10 seconds
Unified score
Unified Score 0–10
  • checkSingle deliverability score weighted across all protocols
  • checkImmediately understand your overall health
  • checkPer-protocol breakdown for targeted fixes
Actionable fixes
Actionable Fixes
  • checkPer-issue fix recommendations in plain language
  • checkNo DNS jargon - instructions any admin can follow
  • checkPriority ordering - fix the most impactful issues first
Free forever
Free - No Account
  • checkCompletely free, no signup or credit card required
  • checkCheck any domain, including competitors
  • checkLive DNS data - not cached
Expandable details
Expandable Details
  • checkSummary cards for a quick overview
  • checkExpandable per-protocol detail sections
  • checkRaw DNS records displayed for technical users
Continuous monitoring
Continuous Monitoring
  • checkUpgrade to automatic daily monitoring with DMARCFlow
  • checkGet instant alerts if your configuration changes
  • checkHistorical score tracking to measure progress

The Difference Between
Checking One Protocol vs. All Four

Most businesses only discover deliverability issues when sales start complaining. By then, the damage is done.

WITHOUT DMARCFLOW
Run 4 separate tools for a partial picture Miss cross-protocol interactions and failures Emails in spam with no clear cause No way to track improvement over time Customers receive spoofed emails from your domain
WITH DMARCFLOW
One scan covers all four protocols Cross-protocol issues surfaced and explained Actionable score 0–10 with clear next steps Historical tracking to prove improvement DMARC enforcement stops domain spoofing Higher inbox placement rates Continuous monitoring with instant alerts Free to start - no account needed

Stop guessing why your emails aren't landing.
Get the full picture - free — in under 10 seconds.

Frequently Decorative underline Asked
Questions

Everything you need to know about email deliverability

Email deliverability is whether your emails actually reach recipients' inboxes. An email can be sent successfully but still end up in spam or be silently rejected. Deliverability depends on DNS records (MX, SPF, DKIM, DMARC), your sender reputation, blacklist status, and content quality. For businesses, poor deliverability means missed sales, unanswered support tickets, and broken customer communication.

The checker runs four simultaneous DNS checks: (1) MX Records — validates mail exchange configuration, priority values, redundancy, and reachability. (2) SPF — parses your SPF record to verify authorized sending sources and check for syntax errors or lookup limits. (3) DKIM — looks for DKIM signing keys for your domain to confirm outbound emails can be cryptographically signed. (4) DMARC — validates your DMARC policy, enforcement level, alignment settings, and reporting configuration.

A score of 8–10 indicates excellent deliverability infrastructure. A score of 6–7 means minor improvements are recommended. Scores below 5 indicate significant gaps that are likely affecting inbox placement. A perfect 10 requires valid MX records with redundancy, a correct SPF record, DKIM signing in place, and a DMARC policy at p=reject with reporting configured.

As of February 2024, Google and Yahoo require bulk email senders to have SPF, DKIM, and DMARC configured. Senders of 5,000+ messages per day to Gmail must have a DMARC policy of at least p=none. Without these, messages may be rejected or heavily filtered. Even if you are not a bulk sender, having all three protocols configured is strongly recommended for best deliverability to Gmail, Outlook, and other major providers.

SPF alone is often not enough. Gmail and other providers increasingly require DKIM for deliverability, as DKIM survives email forwarding while SPF does not. If SPF passes but DKIM fails, DMARC alignment can still fail depending on your policy, which causes filtering. Check all four protocols together — this deliverability checker shows exactly which combination of failures is causing your issue.

Run a manual check any time you change your email provider, add a new sending service, modify your DNS, or notice a drop in reply rates. For proactive monitoring, DMARCFlow's continuous monitoring service automatically checks your domain daily and sends alerts if anything changes — including DMARC aggregate report anomalies, new unauthorized senders, and configuration drift.

Deliverability rate measures how many emails are accepted by the receiving server (not bounced). Inbox placement rate measures how many accepted emails end up in the inbox versus spam. An email can have 100% deliverability but still have a low inbox placement rate if it is consistently filtered. DNS authentication (MX, SPF, DKIM, DMARC) primarily affects deliverability rate — if authentication fails, the email may be rejected or quarantined before reaching the inbox at all.