I had just assumed this functionality would be available. When the time came that I needed it, I was gobsmacked that it doesn't exist. It caught me out badly and left me in a very difficult situation ("Sorry, our system doesn't keep any record of sent emails so I can't help you"). Honestly, it's just embarrassing that you don't have this feature. You could at least warn us that any messages sent by email will be immediately destroyed, because that's not something a normal person would expect to happen.
I had just assumed this functionality would be available. When the time came that I needed it, I was gobsmacked that it doesn't exist. It caught me out badly and left me in a very difficult situation ("Sorry, our system doesn't keep any record of sent emails so I can't help you"). Honestly, it's just embarrassing that you don't have this feature. You could at least warn us that any messages sent by email will be immediately destroyed, because that's not something a normal person would expect to happen.