Thunderbird
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オープンソースの電子メールアプリケーション。

セキュリティ上の注意

Thunderbird does not encrypt your email by default. Here is a guide by Security In A Box to encrypting your email with Mozilla Thunderbird, GNU Privacy Guard (GPG), and Enigmail.

Thunderbird can optionally connect over Tor with the TorBirdy addon.

While Thunderbird can be used as a chat and IRC client, it does not offer encrypted messaging.

サポートされているプロトコル
GPG
RSS
S/MIME
SSL/TLS
Tor