How to save all messages in yandex mail if you plan to create a new mail and delete the old one?

Question

Yandex

Forwarding new letters is not suitable, since the mail will not exist, but I want to keep all the messages that were in the old mail.

Answer 1

Save via thunderbird, outlook, etc.

Answer 2

Choose any email client and archive the letters you need.

Answer 3

In the mail client, connect via IMAP to both accounts and transfer messages from one folder to another. You can set "Load headers only" to avoid loading all tons of messages.