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.
- 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.
- Clickable URI.
- Address book.
- Newly arrived and unread message management.
- 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.
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