Claws Mail is a lightweight, GTK-based email and news client that stores messages in the MH format for fast access and safe, file-based archives. It suits users who want a quick, keyboard-driven alternative to heavyweight desktop mail applications.
Claws Mail is an open-source email client and news reader built on GTK+ that stores messages in the standard MH mailbox format, which keeps individual messages as separate files for fast access and safer data handling. Accounts for POP3, IMAP4rev1, SMTP and NNTP sit in one window alongside a folder tree, message list and preview pane, so you can read, file and reply without leaving the main view. Filtering rules, colour labels, threading, templates and a powerful search function handle the routine work automatically, while SSL connections keep transfers protected. The interface stays familiar to anyone migrating from another desktop mailer, and almost every command can be triggered from the keyboard.
Extensibility is where Claws Mail separates itself from stripped-down alternatives. More than thirty plugins add OpenPGP and S/MIME signing through GnuPG, SpamAssassin or Bogofilter scanning, HTML rendering, PDF and PostScript viewing, a vCalendar agenda, an RSS and Atom aggregator, ManageSieve filters and Python or Perl scripting hooks. Because mail lives in ordinary files rather than a proprietary database, folders can be backed up, synced or moved between machines by hand. Users who pair desktop tools for a specific job often appreciate that same independence — someone running AmneziaVPN for tunneled connections, for example, can combine it with a local mail client that keeps the archive under their own control.
The benefit of Claws Mail is speed without missing features: it opens folders instantly, responds to keystrokes immediately on older hardware, and still offers filtering, scoring, templates and search that heavier clients bury in menus. Reliability matters just as much, because MH storage writes one file per message, so a corrupted folder rarely takes the whole mailbox with it. Configuration is portable — copy your profile folder and your accounts, rules and address book move with it. The plugin system lets you start lean and add only what you actually use, from GnuPG encryption to an RSS reader that turns the client into a single reading hub. Keyboard control keeps hands on the home row, and configurable notifications, toolbars and colour labels let the layout match how you sort mail. Privacy-friendly defaults, offline synchronization and per-folder processing round out a client that stays fast, predictable and under your control day after day.
Claws Mail can collect POP3, IMAP4rev1, SMTP, local mailspool and NNTP news accounts in a single window with a shared folder tree. Each account keeps its own server settings, default identity and folder properties, so personal and work mail stay separate while you read them side by side. Account auto-selection picks the right sender when you reply.
Filtering rules can move, copy, delete, colour, forward or run scripts on incoming messages, and they are applied per folder so each mailbox gets its own treatment. Message scoring ranks mail by header patterns and keywords, while the built-in search and quick-search bar scan full message bodies. SpamAssassin, Bogofilter and Bsfilter plugins plug into the same processing chain.
Compose templates hold reusable text with placeholders for headers, dates and quoted content, which speeds up repetitive replies, invoices or support answers. Actions define external commands that transform a message or reply, so you can pipe mail through a script or launch a custom tool. Message queueing and automatic saving during composition protect unfinished work.
GnuPG-backed plugins handle core PGP functions plus PGP/Inline and PGP/MIME signed or encrypted mail, and a separate S/MIME plugin covers certificates. You can decrypt messages, verify signatures and change the signing or encryption type on the fly while composing. The client also performs anti-phishing URL checks and supports SSL for every protocol.
Optional plugins turn the mail client into a broader workspace: RSSyl reads RSS and Atom feeds, vCalendar handles invitations and webCal subscriptions, and further plugins add PDF viewing, HTML rendering, ManageSieve filters, libravatar pictures and laptop LED notification. Python and Perl interfaces let you script custom behaviour when the built-in options are not enough.
The address book supports automatic recipient completion, including LDAP lookups, plus native import from LDIF, Mutt and Pine, and export to several formats. A harvest feature collects addresses from messages you receive, and a dedicated plugin keeps every recipient in a chosen address book folder automatically, which cuts manual contact admin.
Almost every command has a keyboard shortcut, and the interface uses familiar folder-tree and three-pane layouts that newcomers from other mailers recognise immediately. Toolbars, fonts, colour labels, quotation characters and message colours are all configurable, and a theme mechanism swaps the whole icon set without touching your settings.
Messages are stored in the standard MH format, one file per message, which gives fast folder access, safer recovery and simple backups by copying files. Import tools pull mail and address books from most other clients, and export works just as smoothly, so switching away is never a trap. Mbox and mailspool folders are supported too.
It is a desktop email and news client used to send, receive, organise and archive mail from POP3, IMAP, local mailspool and NNTP accounts. Beyond mail, it reads Usenet newsgroups, and optional plugins add an RSS feed reader, a calendar and other extras, so it can serve as a single hub for several types of correspondence.
Yes. It is open-source software released under the GNU General Public License, so there is no purchase price, subscription or account requirement, and no advertising built into the interface. You can inspect the source code, use it commercially, and modify it under the terms of that licence.
Yes. You can configure as many POP3, IMAP, SMTP, local and news accounts as you need, each with its own server details, identity and folder properties. All of them appear in one window, and automatic account selection chooses the appropriate sender address when you compose a reply.
It supports encryption and signing through its GnuPG-based plugins, covering core PGP functions, PGP/Inline and PGP/MIME mail, plus a separate S/MIME plugin for certificate-based messaging. You can verify signatures, decrypt received messages, and switch the encryption or signing type while writing a message, provided GnuPG and GPGME are installed.
Yes. The client can import messages from almost any other email client and supports mbox import and export, local mailspool and multiple MH folders. The address book imports natively from LDIF, Mutt and Pine formats, and other mailers can be handled through helper scripts, so migration rarely means losing your archive.
Yes. Offline synchronisation lets you download mail and news for later reading, and folders, search and filtering continue to work locally because everything is stored on disk. Messages written offline are queued and sent once a connection is available, which is useful on laptops or unreliable networks.
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