∟Thunderbird to Accept POP3S Certificate Exception
Provides a tutorial example on how to handle POP3S server Certificate Exception on Thunderbird. Just click 'Confirm Security Exception' to accept and store the default certificate provided by Dovecot server.
If you are running a POP3S (POP3 with SSL/TLS) service with Dovecot.
Dovecot will be using a dummy self-signed root certificate by default.
When you connect Thunderbird to this POP3S service for the first time,
you will get certificate exception.
Don't worry. Here is how you can handle this exception.
1. Click "Confirm Security Exception".
This tells Thunderbird to accept and store this certificate.
2. Click "Get Messages" to continue retrieving emails from the POP3S server.
If you are curious about this dummy self-signed root certificate,
click "Thunderbird > Preferences > Privacy & Security" menu.
Then click "Manage Certificates" to open it.
The dummy certificate shows the following:
Organizational Unit: IMAP server
Common Name: imap.example.com
Email Address: email@example.com
The subject name, IMAP server, suggests that Dovecot is sharing the same dummy certificate for both
IMAPS and POP3S service.
If you don't like this default certificate,
Read Dovecot to replace it with your own certificate.