Airmail, an alternative email client for the Mac that's been gaining some popularity lately, has just received another nice update that includes many new features as well as several improvements upon existing ones. Most notably, the update to Airmail brings with it support for multiple signatures, a new way to manage labels, inline quick reply, and much more.
I spent some time with Airmail a while back and found it to be quite impressive even in its infancy stages. With support for Google Drive and much more, it's a heavy contender for one of the better alternative mail apps for Mac.
The new update brings lots of new features on top of the ones mentioned above as well as many improvements and enhancements to existing features. If you've already got Airmail, the update is free. I noticed a decrease in load times across the board after installing the update so I'd recommend it for all Airmail users.
If you haven't tried it out yet, I'd suggest giving it a look, especially if you're tired of Mac Mail's slow performance or are looking for a supported alternative to Sparrow.