I've really wanted the ability to make ad-hoc filters like this in email clients. You'd use it for free food, I'd use it to avoid having to maintain dozens of

I've really wanted the ability to make ad-hoc filters like this in email clients. You'd use it for free food, I'd use it to avoid having to maintain dozens of filters to correctly group a single category of work emails that refuse to be consistent. What did you use? I'm assuming a CLI-based thing, since those seem to be the only ones that are truly flexible, but I haven't found any I actually like.