I will begin working on a fully featured workflow for Airmail3.
There is an airmail API that is accessible by invoking the airmail:// protocol like a magnet link. For example:
airmail://message?mail=your_email%40gmail.com&messageid=[MESSAGE_ID_HERE]
will open the application with the message passed through `messageid`
Will post link here when search feature is implemented. I am not sure yet how I will go about retrieving matched requests, so feel free to post your insights