How to save mail in thunderbird?

Question

Mozilla Thunderbird

Good afternoon! On the computer, mail worked through thunderbird. Now the mail server has moved and the mail remains only in thunderbird on the computer. How to connect new mail servers so that the old mail does not disappear forever?

Answer 1

Thunderbird supports multiple accounts. Just add another one via the menu: Create → Set up my mail account...
If the new server works on the IMAP protocol, then you can even drag old emails to it by simply dragging them from folder to folder in the client.

Answer 2

Now the mail server has moved

What does it mean?
changed domain, username, password, server ip address, protocol?
In the properties of the account, you can change any of the above for incoming. And don't forget about the outgoing server too.