


There are many different open source licenses but they all must comply with the Open Source Definition - in brief: the software can be freely used, modified and shared. Programs released under this license can be used at no cost for both personal and commercial purposes. Open Source software is software with source code that anyone can inspect, modify or enhance. Freeware products can be used free of charge for both personal and professional (commercial use). If you are looking for Claws Mail alternatives, we recommend you to download Mailbirdor Thunderbird.įreeware programs can be downloaded used free of charge and without any time limitations. It provides a personal calendar and a public calendar for import and export. vCalendar: Enables vCalendar message handling like that produced by Evolution or Outlook, and handles webCal subscriptions.TNEF Parser: Enables reading application/ms-tnef attachments.SpamReport: Allows you to report spam messages to various services (SpamCop,, Debian's mailing-lists spam handlers).RSS 1.0, 2.0 and Atom feeds are currently supported. RSSyl: Allows you to read your favorite newsfeeds in Claws.PGP and S/Mime plugins: Enables digital signature and encryption handling.Notification: Provides various ways to notify users of new and unread emails.ManageSieve: This plugin lets you manage Sieve filters on servers that support the ManageSieve protocol.Libravatar federated user domains are also supported. Libravatar: Displays libravatar/gravatar profiles' images or a dynamically generated or predefined alternative.FetchInfo: Adds the information about reception time, account, etc in headers.AttachWarner: Warns when the user composes a message mentioning an attachment in the message body without attaching any files to the message.


Claws Mail is a free email client (and newsreader), based on GTK+, featuring: Quick response, Graceful, sophisticated interface, Easy configuration, intuitive operation, Abundant features, Extensibility, Robustness, and stability.
