Sylpheed has been discontinued. Similar apps include Thunderbird, which is free and open source. Other options are Betterbird, Microsoft Outlook, Evolution and Pelton. Email Clients like Sylpheed are a crowded field, with more than 50 alternatives for Windows, Linux, Mac, Android and iPad.
Hylki is a fast, GNOME-native email client with a three-pane layout, unified inbox, and support for OAuth accounts. Fast to open, effortless to read, and private by default.
United States
Convey is an email application built around conversations, for the GNOME desktop. It allows you to read, find and send email with a straight-forward, modern interface.
United Kingdom
