This is a serious usability problem for people with aging eyes, and it seems to me that it would be extremely low hanging fruit for the Airmail developers. +1
I had no trouble up until recently with Gmail. Now Airmail is 100% useless to me. Would love to see this fixed/addresed. @Devlin Ford –– would love to know what apps you are using that are not causing you trouble. I had to abandon my previous email program as it did not support VPN, and now looking for Airmail alternative.
+1 for Gmail unsend (or a pref within Airmail)