• Contact Us
  • Pricing
  • Search
  • Register
  • Login
  • DNS Tools
    • MX Records
    • A Records
    • CNAME Record
    • PTR Record
    • SPF/TXT Records
    • NS Records
  • Domain Tools
    • ARIN Records
    • WHOIS Records
  • Blacklists
    • Blacklist Checker
    • Whitelist Checker
    • Email Blacklist Removal Tool
  • Email Tools
  • Port Scans
  • Other Tools
    • IP Tools
      • IP Address Converter
      • IP Address Locator
      • IP Range To CIDR
    • Chrome Extension - Email Deliverability Checker
  • Blog
    • First Time Sender
      • Email Certification
      • Email Throttling
      • IP Warming
    • Formatting Emails
      • For Browsers
      • For Devices
      • For Email Clients
    • How To Avoid
    • How To Set Up
    • Mail Tester Guide
      • Email Headers Explained
      • MX Records, PTR Records, and Reverse PTR Records AKA rDNS
      • RFC Syntax Checking
      • Email Port Checks
      • SPF Record and Alignment
      • DKIM Signatures and Alignment
      • DMARC Checker
      • Mail Tester Test Tool
    • Measuring Peformance
      • Bounces
      • Clickthrough Rates
      • Open Rates
    • Related Resources
      • Abuse Contacts
      • Common Ports
      • DMARC and the Contact Us Form
      • Email Identifier
      • Email Headers
      • Email Statistics
      • How Email Works
      • How to Treat Spammers
      • Securing Your Server
    • Rules to Follow
      • Can Spam Act
      • Postmaster Guidelines
  • Member Services
    • Members Area
    • Blacklist Monitoring
    • Complete Monitoring Solution
    • Domain Name Monitoring
    • Feedback Loop Submissions
    • Full Port Scan Monitoring
    • Mail Tester Pro Tool
    • Mail Miner
    • Spam Detector Toolbox
    • Trusted Sender Site Seal


SPF| DKIM| DMARC| rDNS| Sender ID| SSL| Mail Port Checks| Vulnerabilites| Alignments| Acceptance Checks

The Most Comprehensive Tool Of Its Kind

Our Email Authentication Tester uses header information from your email to run more than 100 mail tests against your mail server configuration. If we find references to additional mail servers in your headers, configuration or DNS records, we'll test those, too.

If your email is not configured correctly:

  •  Gmail, Hotmail, Yahoo, AOL, etc might be sending it to spam
  •  It's likely some of your customers don't even receive your emails
  •  Highly possibile you will be listed on different blacklists
  •  You will be losing sales and customers
  •  Customers will get angry from not getting information from you
  •  Your IT costs will increase to clean your IP's and reputation
All email companies requires your emails to be configured properly, read the Postmaster Guidlines.

We Test For

Header Information

  •  Return Path
  •  DKIM Signature
  •  DomainKey Signature
  •  Message ID
  •  X-AntiAbuse
  •  and more

RFC Based Testing

  •  RFC 2045 (MIME)
  •  RFC 4406 (Sender ID)
  •  RFC 4408 (SPF)
  •  RFC 4871 (DKIM)
  •  RFC 5322 (Message Format)
  •  and more

DNS Records Checks

  •  MX Records
  •  rDNS PTR Records
  •  SPF Records
  •  Last Sending Domain
  •  A Records
  •  and more

Email Port Checks

  •  Connection Status
  •  Supported Extensions
  •  SMTP Banner rDNS
  •  SSL Protocol
  •  SSL Cipher
  •  and more

SpamAssassin Analysis

  •  #1 Open Source Anti-Spam Platform
  •  Robust Scoring Framework
  •  Advanced Heuristic & Statistical Analysis
  •  Test Email Headers and Body Text
  •  Bayesian filtering, DNS blocklists
  •  and more

And Much More

  •  SPF Alignment
  •  DKIM Alignment
  •  DMARC Check
  •  Author Domain Signing Policy (ADSP)
  •  DomainKeys Check
  •  and more

Send an email to mailtest@unlocktheinbox.com and within 2 minutes you'll receive an email containing a real report with a summary of your configuration health. When you sign up you'll unlock the full report with invaluable details regarding the configuration of your mail servers.

We offer the following flexible pricing options

Promotional Pricing in Effect

Mail Tester Pro Reports Only*Complete Monitoring Solution
  $29.99 $12.99 (first month)
$19.99 $9.99 (each additional month)
Mail Tester Pro Reports2Unlimited  
Inbox Placement Tester-Included    
Blacklist Monitoring-Included**
Port Monitoring-Included**
Domain WHOIS Monitoring-Included**
Mail Miner-Included    
Email Validations-2000 Monthly
Feedback Loop Submission-Included    
Trusted Sender Site Seal-Included    
Email Support-Standard    
Account RequiredNoYes    
Buy NowCreate An Account
* You'll receive a code to place in the subject of your test emails, when sending an email to mailtest@unlocktheinbox.com.
** Limited to 10 different sites, ports, and email addresses - changeable at anytime - additional quantities can be purchased.

Copyright © 2020 Unlock The Inbox
Privacy Policy and Terms and Conditions