@DoctorSyntax
That's quite an old-fashioned view of email, though, nowadays. For the vast majority, email means webmail, and the concept of downloading a local copy will be quite foreign to them.
I'm a dinosaur, and therefore I use discrete email clients, and fetch my mail down to my local devices using POP3 or IMAP as appropriate, but I'm sure I'm in the minority.
If I pop my clogs tomorrow, my family will be able to get to my emails, but they don't actually know my email account passwords, and they aren't stored anywhere except in my head.