Sylpheed – lightweight and user-friendly e-mail client

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.

Support: Documentation, Mailing List
Developer: Hiroyuki Yamamoto and contributors
License: GNU GPL v2


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

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