Stop hiding addresses
"Sender's Email Address - You don't have to open the message to see the sender's email address. Just hover over the sender's name from your Inbox."
You can't see the senders address without hovering over the senders name even when reading an email this is a really bad safeguarding issue and could make it harder to spot spoofed email addresses.
When you are replying to an email it should show which address you are using to reply without having to click on FROM every single time. I've replied from the wrong address multiple times because you are hiding the address. It should be an option in settings to be the default view you shouldn't have to click FROM everytime you reply to double check its set to the wrong address.