Email DeliverabilityAuditor
Validate SPF, DKIM, and DMARC DNS authentication records to ensure transactional and marketing emails land in the primary inbox.
Email Deliverability Checker & SPF/DKIM/DMARC Auditor | Free DNS Audit: Audit SPF, DKIM, and DMARC DNS records to prevent spam folder placement. Fast, free, and secure client-side execution in your browser.
How to Use the Email Deliverability Auditor
Enter Sending Domain
Type your company domain or email address (e.g., example.com or news@company.org).
Run DNS Audit
Click "Audit Deliverability" to execute simulated checks across SPF, DKIM, DMARC, and MX records.
Inspect Authentication Health
Review individual status badges, DNS record syntax, and mailbox provider compliance.
Implement Inbox Safeguards
Follow recommended DNS records and header configurations to prevent emails landing in the spam folder.
Navigating Modern Email Deliverability, Authentication, and Spam Prevention
Email deliverability is the technical science of ensuring that legitimate outgoing emails successfully reach the recipient's primary inbox rather than bouncing or being diverted to the spam and junk folders. In early 2024, major mailbox providers—most notably Google (Gmail) and Yahoo Mail—enacted stringent, mandatory authentication requirements for all domain senders, permanently altering email marketing and transactional notifications.
Sender Policy Framework (SPF) serves as the first line of authentication defense under RFC 7208. By publishing a TXT record in your domain DNS, you declare the exact IP addresses and third-party relay providers (such as SendGrid, AWS SES, or Google Workspace) authorized to send mail on behalf of your domain. A proper SPF record ends with a `~all` (softfail) or `-all` (hardfail) mechanism to prevent unauthorized relays.
DomainKeys Identified Mail (DKIM) adds an indispensable cryptographic digital signature to every outgoing email header. The sending mail server signs the message using a private key, and receiving mailbox providers verify the authenticity of the message against the public key published under your domain's DNS selector record. DKIM proves that the email legitimately originated from your domain and was not altered in transit.
Domain-based Message Authentication, Reporting, and Conformance (DMARC) unites SPF and DKIM under a comprehensive policy framework codified in RFC 7489. With a DMARC policy set to `p=quarantine` or `p=reject`, domain owners instruct receiving mail servers to automatically discard or quarantine phishing emails and impersonation attempts. Furthermore, DMARC aggregate reports (`rua`) provide visibility into all unauthorized servers attempting to send mail from your brand.
Key Advantages & Architecture
Maximize Inbox Placement
Prevent critical transactional invoices and customer verification emails from landing in spam.
Google & Yahoo 2026 Compliant
Audit compliance with strict mailbox provider sender mandates and alignment standards.
Stop Phishing Impersonation
Protect your brand reputation by enforcing strict DMARC rejection of forged sender headers.
Deliverability Scorecard
Get a clear 0-100 deliverability health score with actionable DNS configuration suggestions.
Instant DNS Diagnostics
Verify SPF string mechanics, DKIM selector formatting, and MX mail exchanger records.
Zero Configuration Needed
Analyze domain deliverability directly in your browser without creating an account or installing agents.
Frequently Asked Questions
All domain senders must configure SPF and DKIM authentication. Bulk senders (sending over 5,000 emails daily) must additionally publish a DMARC policy, maintain spam rates below 0.3%, support one-click unsubscribe headers, and ensure valid reverse DNS (PTR).
Softfail (~all) indicates that unauthorized mail should be accepted but flagged or tagged as suspicious. Hardfail (-all) strictly instructs the receiving mail server to reject and bounce unauthorized mail outright.
No! A domain must NEVER have more than one SPF TXT record. Having multiple SPF records causes a permanent authentication error (PermError) and causes emails to fail SPF checks.
DMARC alignment requires that the domain in the visible "From" header matches either the authenticated SPF domain (Return-Path) or the authenticated DKIM domain (d= tag).
Brand Indicators for Message Identification (BIMI) requires an active DMARC policy with p=quarantine or p=reject, an SVG format logo, and in many providers (like Gmail and Apple Mail), a Verified Mark Certificate (VMC).