Honestly Mail.app has been going downhill the past few years, much like the rest of the OS. 10.6 was stellar, 10.8 was meh, after that it went down the drain.

Honestly Mail.app has been going downhill the past few years, much like the rest of the OS. 10.6 was stellar, 10.8 was meh, after that it went down the drain. I recently switched to Linux Mint (Cinnamon) and there is not a thing I miss. Thunderbird is pretty good too.