boomerang integration /(hide email for a while/tell me if an email has not been responded to)
Self explanatory. Also add Basecamp plugin get someone to do it for you as well as Asana. Finally make sure you have on the notification center a shortcut to write an email using airmail.....
airmail needs boomerang
or mailbutler integration would be even nicer.
Thijs Geerdink commented
"Not been responded to" would be by far the most important feature to add for me
Oleg S commented
Integration with Boomerang is important even if you have the similar functionality inside of Airmail.