However, I'm still in the dark.
Oh geeze, I just found it!
Tagging is a neat feature. While you're composing a message you can add a tag (or a label) to it so that you can find it easily later. If you post recipes a lot, you could tag them with the "recipe" label. Then when you want to find all your recipes, just go into your Preferences, then Tagging, and you can find all of your tags.