Sylpheed runs on Unix-like systems such as Linux, BSD, and Mac OS X. It also supports Windows. Sylpheed uses GTK+ GUI toolkit. The newest version of Sylpheed works with GTK+ 2.4 or later (2.6 or later is recommended). Sylpheed is a free software distributed under the GNU GPL (the library part is GNU LGPL). You can freely use, modify and redistribute it under the license.


  • Simple, beautiful, and well-polished user interface
  • Comfortable operationality which is built in detail
  • Well-organized, easy-to-understand configuration
  • Lightweight operation
  • High reliability
  • Internationalization and Multilingualization support
  • High-level Japanese processing
  • Various protocols support
  • Security features (GnuPG, SSL/TLSv1)
  • Powerful filtering and search
  • Junk mail control
  • Flexible cooperation with external commands

What's new:

  • The function to export the address book to CSV files was added.
  • 'Nick Name' column was added to the address book.
  • Context menu was added to the search result of the query search dialog.
  • When attaching UTF-16 text files, they are automatically converted into UTF-8 now.
  • Show original From on the summary view if the display-name seems to be an e-mail address.
  • The bug that wrong reply target could be selected when the summary was sorted by the unread flag (#286).
  • Win32: the bug that Japanese characters were overlapped on printings with some font settings was fixed.
  • Win32: the bug that empty lines were not properly spaced on printings with some font settings was fixed.
  • Win32: OpenSSL was updated to 1.0.2n.