When I compose a new email with Thunderbird, I can "Customize From Address". That's fine.
When I compose a reply, it would be appropriate to automatically customize the from address, to the address the mail I am replying to was sent.
Example:
I ordered something at webshop.com and put an email address in my profile there: "[email protected]". That way, when webshop.com (or their associates) send me an email, they send it to "[email protected]" . When I reply to that mail, I am replying as "[email protected]". I now have to manually customize the from address to be "[email protected]". That should be the default behavior. Thanks.