See the //email/test From:Full Documentation for more information.

How to run it

Start //email/test From: ("TestSender") by sending us an email.

See below for how and where to send the email.

Before using //email/test From: you may want to list in your list of allowed domains (whitelist us) so the report //email/test From: returns to you is not sent to your spam folder.

We cannot respond to Challenge-response email filters (e.g. SpamArrest, Support Sentry SpamBlock, iPermitMail) so you MUST manually allow mail from

This passcode only works once. You can refresh this page to receive another one.

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What it does

When you send an email to the special address listed below with your unique passcode, //email/test From: performs all the steps that Internet email systems go through to receive email. It records every command and byte of data that your system sends and every answer and byte of data that our system replies back. //email/test From: does actually receive your email, and it learns as much about your system as it can in the process.

Because CheckTLS focuses on security, //email/test From: tries to establish a secure (TLS) connection with your system. Along with recording everything, it looks at the security of the your system for things like: certificate contents and signers, encryption algorithms, key lengths, hostname mis-matches, weak cyphers, etc.

What it shows

//email/test From: replies to your email with its results.

The reply email looks like:

From: CheckTLS Test Sender TLS <>

SUCCESSFUL //email/test From:

Your email was sent securely using TLS.

Extra Items Shown
Input Fields
TestSender parameter entry

This //email/Test From: test ("TestSender") requires you to send us an email after you tell us to listen for it.
Open Instructions/Info above for more information.

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More information will show here when a Listener is Started.