"Reply To" as a filter/rule option

The Problem

I like to filter my newsletters into a “news” folder. One of the clearest indicators that a message is a newsletter is a “reply-to” address @inbound.mailchimpapp.net and using "Recipient" / "Matches expression" / "*@inbound.mailchimpapp.net" doesn’t catch those.

Proposed Solution

I would like an option in the mail rules pull down to create a rule based on the "reply to " address.

(Originally posted by amandabee on GitHub.)