Email Deliverability Tester
Assess domain email deliverability posture by auditing MX mail server redundancy, SPF authorization, DMARC policy enforcement, and BIMI brand indicators.
Interactive Workbench
Real-time processing directly in your browser.
Browser-Based Domain Deliverability Posture Audit
The Email Deliverability Tester provides a comprehensive evaluation of domain-level email deliverability signals. Operating directly in your browser using DNS-over-HTTPS queries, domain owners, marketers, and IT managers can assess mail infrastructure posture without executing intrusive test mailings or sharing subscriber lists.
This utility audits Mail Exchange (MX) server records for availability and redundancy, Sender Policy Framework (SPF) records for authorization directives, DMARC policy enforcement strength, and Brand Indicators for Message Identification (BIMI) deployment status.
The tool calculates a 0–100 deliverability score and grade (A+ through F), accompanied by a detailed checklist and actionable recommendations. Note: The tool evaluates DNS and authentication posture; actual inbox placement depends on subscriber engagement, real-time ISP reputation, and spam filter algorithms.
Core Tool Capabilities
- MX Mail Server Redundancy Audit: Queries active MX DNS records to confirm mail server availability and preference ordering for incoming message routing.
- SPF Authorization Assessment: Evaluates SPF record directives to verify that unauthorized senders are rejected (-all) or softfailed (~all).
- DMARC Enforcement Posture Audit: Checks DMARC policies (p=reject, quarantine, none) to ensure domain reputation protection against email spoofing.
- BIMI Brand Visibility Check: Verifies the presence of BIMI DNS records to confirm eligibility for verified brand logo display in inbox clients.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • Pre-Campaign Deliverability Health Check
- • Domain Reputation Protection
- • New Domain Setup Verification
- • MSP and Agency Client Auditing
Technical Specifications & Platform Limits
Core DNS-based email deliverability pillars.
Objective posture scoring based on authentication strength.
Browser-native query execution without server proxies.
Zero storage of queried domain names or email data.
Step-by-Step Workflow
Enter Domain Name
Enter your sending domain name (e.g. shrtx.in) in the input field.
Click Test Deliverability Signals
Click the test button to query live MX, SPF, DMARC, and BIMI records via DNS-over-HTTPS.
Review Overall Score and Grade
Examine your overall deliverability score and grade (A+ through F) alongside the DNS configuration checklist.
Implement Remediation Recommendations
Follow the actionable recommendations to upgrade DMARC policies or resolve SPF syntax issues.
Practical Real-World Use Cases
Pre-Campaign Deliverability Health Check
Email marketers verifying authentication configuration before launching major email campaigns.
Domain Reputation Protection
System administrators ensuring DMARC policies are enforced to protect domain sender reputation.
New Domain Setup Verification
Startup founders verifying MX and SPF records when configuring new custom domain email addresses.
MSP and Agency Client Auditing
Managed service providers conducting quarterly email infrastructure health assessments for client domains.
Frequently Asked Questions
- Does this tool guarantee inbox placement?
- No. This tool evaluates DNS and authentication configuration posture. Actual inbox placement depends on receiver engagement signals, spam filter content algorithms, and real-time IP reputation.
- Why is an MX record required for deliverability?
- MX records tell receiving mail servers where to route incoming mail and bounce notifications. Without valid MX records, receiving servers cannot send bounce reports, impairing deliverability.
- How does DMARC improve email deliverability?
- DMARC prevents spammers from forging your domain name. By blocking unauthorized spoofed mail, DMARC protects your domain reputation, ensuring legitimate emails reach user inboxes.
- What is BIMI and how does it affect inbox placement?
- Brand Indicators for Message Identification (BIMI) allows organizations with enforced DMARC (p=quarantine or reject) to display verified logos in supported webmail clients, boosting open rates and trust.
- What should I do if a live DNS query fails?
- If DNS-over-HTTPS queries fail due to network restrictions or offline status, verify your internet connection or check your domain using an alternate public resolver.
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Master this tool with Guides & Articles
Learn the workflows, common mistakes, and advanced techniques behind Email Deliverability Tester - MX, SPF & DMARC Posture Audit with our deep-dive educational content.