Hi Alexandra. Unfortunately, I only studied French for one year and too much time ago :(
I'll try to answer your questions using Google translate:
Unfortunately, most of the email clients don't allow you to import HTML emails.
We provide some options to save and send your message in https://support.beefree.io/hc/en-us/articles/360004545991-Saving-a-message-on-beefree-io, but the proper solution depends on the software that you're using to send the messages.
For example, if you're using Gmail, we provide a feature in BEE Pro to export with one click the messages to your account. But if you don't need something advanced and want to continue using free software, we recommend installing in Gmail our free templates add-on.
Currently, we don't provide this kind of feature/add-ons for other email clients.