@Reiki 不是， 不需要郵件，官網介紹：
Retroshare establish encrypted connections between you and your friends to create a network of computers, and provides various distributed services on top of it: forums, channels, chat, mail... Retroshare is fully decentralized, and designed to provide maximum security and anonymity to its users beyond direct friends. Retroshare is entirely free and open-source software. It is available on Android, Linux, MacOS and Windows. There are no hidden costs, no ads and no terms of service.

機翻： 复古共享在您和您的朋友之间建立加密连接，以创建计算机网络，并在其顶部提供各种分布式服务：论坛、频道、聊天、邮件。。。复古共享完全分散，旨在为用户提供超越直接朋友的最大安全性和匿名性。复古共享是完全免费和开源软件。它可在安卓、利努克斯、MacOS 和视窗上使用。没有隐藏的成本，没有广告，没有服务条款。