Changed Host - Redo Auto Config
I recently had to change host providers and would like to run the automatic configure, and save existing emails, can not find a way to run auto config on an existing account - DE
Alla svar (1)
There is no automatic reconfigure of existing accounts. You will have to manually enter the changes.
If your account is IMAP unless you have transferred email at the server level all existing mail will be lost in the transfer. If you still have the original server, I suggest you export all mail from the account to an mbox file before you do anything else. The import export tools addon will do it for you. https://addons.thunderbird.net/en-US/thunderbird/addon/importexporttools-ng/