What does a lock icon mean next to my main inbox folder?
I use Thunderbird to manage my email and cannot connect the to provider's server. I can connect with another device and directly on the internet. I don't remember seeing this icon of a padlock next to the main folder before. Could this be my problem?
Chosen solution
A padlock next to the account means Thunderbird has that account set up to use encryption (SSL/TLS) to connect to the remote server.
If you're not able to access it, then it could be that your settings are wrong, for example set to use SSL/TLS, but the server does not support it or you have the wrong address / port configured.
Find out from your provider what encryption settings they support and make sure Thunderbird is set up to use them: look in Account Settings then Server Settings.
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Chosen Solution
A padlock next to the account means Thunderbird has that account set up to use encryption (SSL/TLS) to connect to the remote server.
If you're not able to access it, then it could be that your settings are wrong, for example set to use SSL/TLS, but the server does not support it or you have the wrong address / port configured.
Find out from your provider what encryption settings they support and make sure Thunderbird is set up to use them: look in Account Settings then Server Settings.
Thanks much!