At the moment, drupe can only access one email app at a time.
If you use more than one app for your various email accounts, we suggest that you consider keeping the various accounts in one app (TypeApp, BlueMail, etc.). You can do this even if you use email accounts from different providers, like Gmail and Microsoft for example.
Once all your email accounts are managed from one app, you can drag your contact to the email action icon, and then tap the "From" line to select the desired email address from the drop-down menu.