How to migrate sent folder of external account from Zoho

Hi guys,

I am actually looking to a Plan B due to latest problems with Zoho.

I have 5 external accounts that I have used in Zoho for about 6 years. All of them keep a copy of received Mails on the server, so regarding my inbox I can easily change to another service.

But as one of the accounts is my work account I definitely also have to migrate the sent items of this account. They only exist in Zoho and there´s no copy anywhere.

- Export (Options): doesn't work for added accounts and such a long period
- Imap / Pop Connection to Zoho: doesn't offer access for added accounts

There are too many Mails in that folder to manually forward them.

Any ideas or workarounds? I'd really appreciate your help