CheckTLS

A web tool that tests whether a recipient's mail server accepts secure TLS connections for email.

FreemiumProprietaryWeb

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About CheckTLS

CheckTLS TestReceiver takes an email address and goes through the steps a mail system uses to deliver a message, recording every command and response, without actually sending an email. It focuses on whether a secure TLS connection can be made to the recipient's server.

The site also has tests for sending servers, mandatory TLS, batch testing, baselines, monitoring, certificate and CSR decoding and an API, several of which are part of paid subscriptions. It suits administrators with compliance needs such as HIPAA or GDPR.

Strengths

  • Shows the full SMTP conversation step by step
  • Tests TLS without sending a real email
  • Extra tools for certificates, monitoring and batch tests

Limitations

  • Cluttered interface with many menus
  • Advanced features require a subscription

Details

Pricing
FreemiumBasic tests are available to visitors; batch, monitoring and other features need a paid subscription.
License
Proprietary
Developer
CheckTLS
Platforms
Web
How it runs
Web application, Hosted service
Account
Not required
Works offline
No
Best suited for
Verifying that email to a domain can be delivered over TLS
Last verified
Added
Provenance
Selected from the TechWalrus Resource Hub (Website Checkers & Audit Tools); facts checked against the developer's own pages, 2 sources on file.

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