I am not sure if this is a good idea. Not all addresses of the same domain name, for example *@gmail.com, will be trustworthy, which could lead to enabling the less safe original message view when this is not desired.I am not sure if this the right place to ask for new features.
When "showing the original message ..." in addition the check-boxes "do not ask ... email-address" could there be a box or option to allow any message from *@server or just server.
For example if I get and email from support@mybank.com I could elect to elect to allow from any sender at mybank.com.
TIA
I will put this on my to do list and think some more about it.