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Security Certificate Issues
Last modified on 30 September 2019 09:51 AM

Security Certificates are used for the StartMail website and for IMAP connections. Their purpose is to verify that you are safely connected to StartMail. Below you will find some of the most common issues users face with the StartMail Security Certificates.

Websites may show an error message stating that the connection is insecure. This is caused by a missing or invalid Security Certificate. If this is the case, no secure connection can be setup. Users can often still continue to use the website, but their connection will not receive an SSL/TLS encryption if the Security Certificate is missing. These error messages should be taken seriously, as they can also point to a so called "Man-in-the-Middle attack". (To learn what a Man-in-the-Middle attack is, please consult this Wikipedia article.)

Here are some examples of error messages displayed when the Security Certificate is missing or incorrect.

Firefox

Chrome

Fixing Certificate Errors

Operating Systems use a global certificate database available to all applications, so on a regular machine you will not need to install our certificate separately.

If for some reason you install certificates on your machine on a case-by-case basis, you will  need to install the Intermediate Certificates for Let's Encrypt.

You can find more information about that on this page: https://letsencrypt.org/certificates/

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