
Mailspring
Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.
Geary is an email application built for GNOME 3. It allows you to read and send email with a simple, modern interface.
geary is a lightweight email program designed around conversations and built for the gnome desktop.
it's designed to let you read your email quickly and effortlessly. its interface is based on conversations, so you can easily read an entire discussion without having to click from message to message.
geary is written in vala .
features
modern and straightforward interface quick account setup supports gmail, yahoo! mail, outlook.com, and popular imap servers (dovecot, cyrus, zimbra, etc.) mail organized by conversations fullfeatured html mail composer fast keyword search desktop notification of new mail
email-client gnome-integration