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Unlock the Inbox is a resource and tool site that’s dedicated to helping companies and individuals properly configure their email to ensure better deliverability rates. On their site you will find tools related to everything email (DNS Lookups, Blacklists, SPF, DKIM and DMARC Wizards, etc.) and more.

Unlock the Inbox is perhaps best known for their email authentication tester. Simply send an email to and it will auto-respond with your results in minutes (you can try this out right now for free). What makes this service so unique is that it offers more than just simply checking SPF, SenderID, and DKIM. In fact the Pro Version checks, displays and validates many different aspects of your email, including:

  • DKIM and SPF Alignments
  • Mail Headers
  • MX Records
  • rDNS PTR Records
  • SpamAssassin Spam Score Report
  • ISIPP Certification
  • Spam Ratings
  • Mail Flow
  • Acceptance of Abuse and Postmaster email addresses
  • Email Port checks For (SMTP, IMAP, POP3)
  • Server Greetings
  • SSL Validity
  • SSL Key Sizes
  • Vulnerabilities

In addition, they offer services to monitor your domains and IPs for Blacklists, ICANN Registry changes, and open and closed ports, and you will be notified if something changes.

Unlock the Inbox offers all these services and more for only $7.99 per month, and we at ISIPP SuretyMail are pleased to endorse them!

You can check out Unlock the Inbox here.

Need help setting up your email authentication (DKIM, DMARC, SPF, etc.) correctly? 
Check out our SPF, DKIM, DMARC and rDNS Email Authentication Set Up service here.

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  1. This is one of the essential troubleshooting tricks that an Exchange administrator needs to know, sending an email using Telnet from the command line.

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