Only group emails when part of a thread
I like that Airmail groups emails as conversations but IMO the feature needs more options.
Right now I'm getting emails that aren't true conversations grouped together, e.g. where I get two emails with the same subject line. These emails don't follow on from one another and both require a separate response, but since Airmail groups them and automatically expands the top email, the others are effectively hidden and easy to miss.
Can we have an option to only group emails where there is a genuine thread of conversation between two people, rather than grouping by subject line? It must be possible since I've never had this problem with another email program.