I wonder how we could import EMail-conversations we have had in the past with different suppliers into Odoo 14?

The content of them would be mostly important for current and future orders and to search always in a 2nd application for isn´t really comfortable.

We can export each single message we have sent or received in format EML or CSV, or we can store all messages, selected for an supplier, in chronological order with the mentioned formats into import-folders.

Which possibilities are given for a solution?