Thunderbird is checking against C:\Program Files\Mozilla Firefox\distribution\policies.json at start. Some guys collected this for the latest version: https://fossies.org/linux/thunderbird/comm/mail/components/enterprisepolicies/schemas/policies-schema.json Thank you very much! Maybe this stuff is triggerable through the registry.
When Thunderbird starts it ignores already existing registry entries. That means, if you have had deleted an extension via UI and you did not change the registry entry (deleting or modifying) afterwards TB will not install this extension again. In other words: If you have once installed an extension via registry and you delete it […]
Debug it using the Developers error console. Try using ASCII (PEM) instead of Binary (DER) certs.
Basics: https://bytesandbones.wordpress.com/2019/09/30/thunderbird-gpo-admx Via Registry: HKCU\Software\Policies\Mozilla\Thunderbird\Certificates\Install\1 = “mycert.der” or Software\Policies\Mozilla\Thunderbird\Certificates\Install\2 = “\\MYHOST\Users\username\mycert.pem” or Software\Policies\Mozilla\Thunderbird\Certificates\Install\3 = “C:\CERTS\mycert.pem” as REG_EXPAND_SZ. If you define only a file name without a path Thunderbird searches %USERPROFILE%\AppData\Local\Thunderbird\Certificates%USERPROFILE%\AppData\Roaming\Thunderbird\Certificates for your files. Via GPO: Use the user branch. Define full path file location or file names only. If you specify only a file […]
It sends your file always to outlook, even you have changed your default app to another mail client. Go to your registry and check HKLM\Software\Clients\Mail\Mozilla Thunderbird Then add ”Mozilla Thunderbird” as Standard.
Add your custom header. Do a folder repair. Thats all.