Protection
Protection against mass surveillance and spying. ShutUpTrackers is a socially motivated website that provides information for protecting your data security and privacy
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THUNDERBIRD
Thunderbird is a free, open source, cross-platform email, newsgroup, news feed, and chat (XMPP, IRC, Twitter) client developed by community, previously by the Mozilla Foundation.
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CLAWS MAIL
Claws Mail is a free and open source, GTK-based email and news client. It offers easy configuration and an abundance of features. It is included with Gpg4win.