Sylpheed

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Freedom report

Two barsScore 5.6

Free tierA free tier is on its own pricing page
Runs widely3 of 6 device platforms
DocumentedThinly documented

Sylpheed is ranked #96 of 143 in email clients on Freedom251. It runs on Linux, macOS, Windows. There is a free plan.

Sylpheed plans and pricing

All plans

Sylpheed Free GNU GPL software; no price stated sylpheed.sraoss.jp · 12 Oct 2026

Compared on email clients

Free plan: Yes
App coverage: desktop
Offline access: Yes

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The record

Product: Sylpheed is a lightweight, user-friendly email client designed for beginners through power users.
Mail protocols: It supports POP3, IMAP4rev1, SMTP, and NNTP, as well as IPv6.
Email security: It optionally supports GnuPG message signing and encryption, and SSL/TLSv1 connections for POP3, IMAP4, and NNTP.
Filtering and search: Filters can match headers, message body, size, date, and flag status, and search results can be saved as search folders.
Storage: Messages use MH format, with one file per message, which the maker says helps with backup, migration, and processing by other applications.
Junk mail: Junk mail control uses external commands, including bogofilter and bsfilter, and can use other programs as well.
Integrations: Sylpheed can call external commands for filtering and message composition, and can work with fetchmail or procmail for receiving mail.
Attachment encryption plugin: An optional plugin automatically packages outgoing attachments as encrypted ZIP files and creates a password notification email; it requires Sylpheed 3.5.1 or later and 7-Zip.
Languages: The maker says Sylpheed is translated into 30 languages and includes internationalized line wrapping in its editor.
Supported systems: The maker lists Windows, Linux, BSD, Mac OS X, and other Unix-like systems; its requirements page specifies Windows 7/8.1/10 or Linux or another POSIX-compliant Unix-like OS.
Release status: The site lists version 3.7 as stable, updated 31 January 2018, and version 3.8beta1 as the development version, updated 14 September 2022.
Support: The Sylpheed mailing list was discontinued in 2025, and the maker points users to GitHub Issues for information sharing and bug reports.
License: The maker describes Sylpheed as free software distributed under the GNU GPL, with its library part under the GNU LGPL.
Price from: Free

Where it ranks on Freedom251

Best Email Clients in 2026#96 of 143

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Sources

sylpheed.sraoss.jp/en/· checked 12 Oct 2026
sylpheed.sraoss.jp/en/features.html· checked 12 Oct 2026
sylpheed.sraoss.jp/en/plugin.html· checked 12 Oct 2026
sylpheed.sraoss.jp/en/requirement.html· checked 12 Oct 2026
sylpheed.sraoss.jp/en/news.html· checked 12 Oct 2026