Geary is an email application built around conversations, for the GNOME 3 desktop. It allows you to read, find and send email with a straightforward, modern interface.
Conversations allow you to read a complete discussion without having to find and click from message to message.
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
Full-featured HTML mail composer
Fast keyword search
Desktop notification of new mail