How to view certificates for mail servers?

Thunderbird periodically ask you if you approve adding exception for mail server certificates. After such certificate is added, how to view, edit, or remove it?

I found it

Steps:

  1. Using Thunderbird, navigate to Edit > Preferences > Advanced > Certificates > Manage Certificates

  2. Using the “Certificate Manager” window, click on this “Servers” horizontal tab

  3. Using this “Servers” horizontal tab, you are able to view or delete certificate
    Screenshot

This “Servers” horizontal tab collects only exceptions that you have manually approved. It does not cache CA-validated certificates. This is normal.

If you need to view CA-validated certificates, the other steps below are one easy and free way to do this.

Steps to view CA-validated certificates:

  1. Using your favourite internet browser, such as Firefox 91, go to the URL hosting the mail server certificate. For example, go to https://mailbox.org

  2. Using Firefox, click on the small lock button. Which is located on the left side of the URL field.

  3. Click on the ~“Secured connection” line

  4. Click on ~“More information” line

  5. Click on ~“View certificate” button

[Solved] I’ve deleted the certificates but how do I get new ones for the mail server? My email host changed their SSL certificates that protect the mail connection. I now have new SHA1, SHA256, and MD5 but haven’t a clue how or where to insert them.

My email setup has no obvious way to add certificates, the Settings/Certificate Manager/Server has no way to add a new code. When I tried using Add Exception it came back and said there was no problem with the mail server…

[Solution] Rebuild the email account for each affected user. This rebuilds the Certificate when you next download new email.

Running Thunderbird 128.6.0 (64-bit).
Thanks!