It seems that default account - and email address - is the last account added and that email address is used when writing a new email or replying. How do I change that order without deleting and re-creating the account that I want to be the default?
Sorry, i haven't come across this problem. For example, in the email app, you highlight the email account you require and send directly from there using that email address.
I noticed this when replied to email sent to account1. 'From' email address was from taccount2 that was added last.
n.b. it is really painful to write with Jolla browser. Have you tried to change cursor position in the text? Almost impossible, screen can be zoomed but is restored back to normal when tapping. So you're back to square one.