Simpler email subject lines

I see in my smtp logs that replies to topics that used to have the subject:
[community_name][category_name] Topic

now have this subject:

community_name: Topic

This is good, but can we also have the category somewhere, maybe even in the email body? How would one filter their email inbox by category, eg support is important, but offtopic is not?

Edit: oh, I see it’s in X-Discourse-Category: [category] header :+1: