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When replying, the default is to quote (include) the information that was in the message that you reply to. If a key has been published on the Internet, you may download the key and use OpenPGP key manager to import the downloaded file. This means that certain keys which are supported by GnuPG / Enigmail may not work with Thunderbird 78 by default, especially some keys with an advanced structure.
to Find Your Mozilla Thunderbird Profile Directory - Lifewire How to Find Your Mozilla Thunderbird Profile Directory - Lifewire
Because the Enigmail tool only migrates keys and settings that were managed using GnuPG, it cannot migrate the trust settings that were managed by pEp software.Take a moment and confirm that your profile is still intact, and then consider whether it would be quicker to recover the data from the old profile than to keep trying to move it.
Thunderbird Features — Thunderbird Thunderbird Features — Thunderbird
Normally your profile is intact, and it just takes several tries to figure out how to move the profile. Thunderbird 91 and later supports importing and using OpenPGP personal keys with an offline primary key. import your data, then upgrade to the latest version of Thunderbird via the built-in update mechanism.x. Once installed, you can manually access the command "Migrate Enigmail Settings" from Thunderbird's top menu bar, in the Tools submenu. For example, you can use this tool to migrate accounts, messages, address books, calendars, and settings into your current Thunderbird application.
Thunderbird Features — Thunderbird
For example, if all public keys in total have a size of 17 MB, you would have to create 4 files, and select a quarter of public keys for each exported file. The information collected through these tracking and performance cookies do not identify any individual visitor. Your bank account number is never transferred to us nor seen by us, but handled only by Stripe, our payment provider. If you are importing from another Thunderbird profile, and your source folder is larger than 2 GB, please use Import from another Thunderbird installation in step 1 and then select Choose a profile folder in step 2 of the import.If Eudora is not installed and you want to use the Thunderbird import wizard, you can easily change the Windows registry to point to your Eudora files, then run the import wizard.