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Domain Deliverability
Score Checker

Analyze your domain's deliverability and DNS recordsGet instant insights to improve email authentication

Enterprise DNS Audit
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Real-time Analysis

Domain Deliverability Analysis

Enter your domain to get instant insights into your deliverability health

🔍 Live DNS lookup - may take a few seconds

Enterprise DNS Audit

Complete SPF, DKIM, DMARC, and MX validation

Risk Assessment

Get instant risk level analysis for email spoofing

Actionable Insights

Receive specific recommendations to improve deliverability

InboxKit Infrastructure Analysis

SPF Validation

Verify authorized mail servers for your domain

DKIM Authentication

Digital signature verification for email authenticity

DMARC Policy

Email authentication policy enforcement

MX Records

Mail exchange server configuration check

DNS Records Guide

Essential DNS records for email authentication and deliverability

SPF Record

Authorizes sending servers

DKIM Record

Digital email signatures

DMARC Record

Policy enforcement

MX Records

Mail server routing

SPF Record Details

SPF (Sender Policy Framework) allows domain owners to specify which mail servers are authorized to send email on behalf of their domain.

v=spf1 include:_spf.google.com ~all
•v=spf1 - Version identifier
•include: - Authorize another domain's SPF
•~all - Soft fail for unauthorized servers

DKIM Record Details

DKIM (DomainKeys Identified Mail) adds a digital signature to emails, allowing receiving servers to verify authenticity.

selector._domainkey.yourdomain.com

Common selectors:

googledefaultselector1selector2mailgunsendgrid
•Use 2048-bit keys minimum
•Rotate keys periodically
•Different selectors for different services

DMARC Record Details

DMARC (Domain-based Message Authentication) builds on SPF and DKIM to protect domains from unauthorized use.

v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com

Policy levels:

p=none - Monitor only
p=quarantine - Send to spam
p=reject - Block delivery
•rua= - Aggregate reports email
•pct= - Percentage to apply (0-100)

MX Record Details

MX (Mail Exchange) records direct email to mail servers for your domain with priority ordering.

10 mail.yourdomain.com
20 mail2.yourdomain.com

Common providers:

Google Workspace

aspmx.l.google.com

Microsoft 365

*.protection.outlook.com

•Lower priority number = higher preference
•Keep backup MX servers configured
•Test before switching servers

Common DNS Configuration Mistakes

Multiple SPF Records

Only one SPF record allowed per domain

❌ Two separate TXT records
✅ Single combined record

Too Many DNS Lookups

SPF maximum 10 DNS lookups

❌ Nested includes exceeding limit
✅ SPF flattening or fewer includes

Wrong DKIM Selector

Service-specific selectors required

❌ 'default' for Google
✅ 'google._domainkey'

Aggressive DMARC Policy

Gradual policy enforcement needed

❌ Immediate p=reject
✅ Start with p=none

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