Andrew Gallagher <andrewg@andrewg.com> 0xFB73E21AF1163937
Fingerprint: 00CC 54C6 A0C6 0169 1AF4 931F FB73 E21A F116 3937
I recommend Thunderbird.
You can use Mailvelope (a plugin for Chrome and Firefox) with many popular cloud-based email providers, e.g. Gmail and Yahoo Mail.