Understand, Monitor, and Improve Your Sender Reputation
The industry's most comprehensive resource for email deliverability intelligence. Check your domain's reputation in seconds.
How It Works
Get actionable insights about your email reputation in three simple steps.
Enter Your Domain
Type in any domain name to start the analysis. No signup or account required - just enter a domain and go.
We Analyze Everything
Our system checks SPF, DKIM, DMARC, all major blacklists, MX records, reverse DNS, and mail server infrastructure in seconds.
Get Your Reputation Score
Receive a comprehensive A-F grade with a detailed category breakdown and actionable recommendations to improve deliverability.
Free Email Deliverability Tools
Professional-grade tools to diagnose and fix email delivery issues.
Sender Reputation Checker
Get your free Sender Reputation Score with a full authentication and infrastructure audit.
Try it free →Blacklist Checker
Scan the most impactful DNS-based blacklists instantly for your domain and IP addresses.
Try it free →SPF Record Checker
Validate your SPF record syntax, lookup count, and mechanism configuration.
Try it free →DKIM Record Checker
Verify your DKIM key is published, properly formatted, and using strong encryption.
Try it free →DMARC Record Checker
Check your DMARC policy, alignment settings, and reporting configuration.
Try it free →Email Header Analyzer
Parse and analyze raw email headers to trace delivery path and identify issues.
Try it free →MX Lookup
Look up mail exchange records and verify your mail server configuration.
Try it free →Reverse DNS Checker
Verify your PTR records match your sending IPs for proper reverse DNS setup.
Try it free →Learn Email Deliverability
In-depth guides for every experience level.
What is Sender Reputation?
Your sender reputation determines whether your emails reach the inbox. Learn what factors ISPs use to evaluate your sending practices.
Read guide →The Complete Guide to Email Authentication
SPF, DKIM, and DMARC form the foundation of email security. This guide walks you through setting up all three correctly.
Read guide →How to Get Removed from an Email Blacklist
Landed on a blacklist? Follow this step-by-step guide to identify the cause, request delisting, and prevent recurrence.
Read guide →Latest from the Blog
News, tips, and insights for email senders.
VMC vs CMC: Which BIMI Certificate Your Brand Actually Needs in 2026
Gmail now accepts two certificate types for BIMI logos, and the choice between them comes down to trademark ownership, budget, and how badly you want the blue checkmark. Here is the complete decision framework.
Read more →Custom Tracking Domains: Why Default ESP Links Are Quietly Killing Your Click-Through Rates
Every link in your email gets rewritten by your ESP to a shared tracking domain. That shared domain is being blocked, blacklisted, and stripped by corporate filters in 2026. Here is the complete fix.
Read more →DANE and TLSA Records for Email: The Advanced Transport Security Layer Beyond MTA-STS
DANE uses DNSSEC to pin TLS certificates directly in DNS, eliminating reliance on certificate authorities. Here is how DANE actually works for SMTP, how to deploy TLSA records, and why Microsoft enabled DANE in 2026.
Read more →