Sylpheed – lightweight and user-friendly e-mail client

Last Updated on October 23, 2023

Sylpheed is a simple, lightweight and featureful e-mail client based on the GTK+ GUI toolkit. It aims to combine a quick and responsive client, with a sophisticated interface, intuitive operation, as well as an abundant feature set.

Sylpheed uses a 3-paned display similar to the popular e-mail clients for Windows such as Outlook Express and Becky. Many commands are accessible with the keyboard like the Emacs-based mailers such as Mew and Wanderlust. This enables users to easily migrate to Sylpheed.

It stores mail in the MH Message Handling System.

It supports the following protocols: POP3, IMAP4rev1, SMTP, NNTP, SSL/TLSv1 (POP3, SMTP, IMAP4rev1, NNTP), IPv6.

Features include:

• Multiple accounts.
• Powerful filtering (POP3, IMAP4, local spool).
• Powerful search (query search, quick search, search folder).
• Junk mail control.
• Thread display.
• Display and transfer of attachments by MIME.
• Inline image display.
• News reader.
• SMTP AUTH support (PLAIN / LOGIN / CRAM-MD5).
• CRAM-MD5 authentication (SMTP AUTH / IMAP4rev1).
• APOP authentication (POP3).
• PGP signature / encryption (requires GPGME).
• Spell checking (requires GtkSpell).
• X-Face display.
• User-defined headers.
• Mark / color label.
• Mew/Wanderlust compatible key bind.
• Multiple MH folder support.
• mbox importing / exporting.
• Action function to work with external commands.
• External editor.
• Message queueing.
• Automatic mail checking.
• Draft message.
• Template.
• Line-wrapping.
• Autosave.
• Clickable URI.
• Address book.
• Newly arrived and unread message management.
• Printing.
• Offline mode.
• Tray icon (minimize to tray icon, new mail notification).
• Customization of toolbar.
• Remote operation by command line.
• Per-folder configuration.
• LDAP, vCard, and JPilot support in address book.
• CSV, LDIF file import in address book.
• Drag & Drop.
• Autoconf, automake support.
• Internationalization of messages by gettext.
• m17n (multilingualization) support.

Website: sylpheed.sraoss.jp
Support: Documentation, Mailing List
Developer: Hiroyuki Yamamoto and contributors
License: GNU General Public License v2.0

Sylpheed is written in C. Learn C with our recommended free books and free tutorials.

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