Blocked content unblocker?

I am sure someone has requested this before but it would be great if the program automatically added an email to a safe list once the “view blocked content” has been clicked. I don’t want to add a load of unwanted email addresses to my contact list. I also don’t want to change the main settings to keep as secure as possible. However to be able to view emails received regularly from a known source would be great (just like Android clients) without having to click buttons. Anyone agree?