When I was using lotus notes there was a similar feature, but it didn't work very well.
As the message was sent to you inbox, you could modify the properties on the message, I created a button to unprotect the message because there were several people in my group who always had their message confidential and the information needed to sent to others quite frequently.
I remember this shop very fondly, I used to walk home from school, and pick up quite a few components for various electronics projects, but while I was away at uni it closed, I was very disappointed when I went back to my parents.
I can't remember what it was called. But I had a friend who worked there many years ago.
I FOUND IT!
It was called Techno Trade
street view was only good back to 2008 and it was already something else but a search on the address came up with: https://www.yelp.co.uk/biz/techno-trade-fareham
I have seen colleagues have to do very similar things on embedded platforms, when there is a large pressure on price, a smaller amount of flash on an MCU will make the MCU cheaper.