Someone emails sensitive material that you don't want persisted (e.g a password) in your account. Yes it may keep being persisted somewhere else due to the natu

Someone emails sensitive material that you don't want persisted (e.g a password) in your account. Yes it may keep being persisted somewhere else due to the nature of email but hey, it very much depends on your threat model, you don't control what the sender decides to send anyway, and you can do a best effort for it not to become a liability on you.