For asynchronous anonymous communication, I have been experimenting with Pond recently [0]. Message have perfect forward security from each previous, are anonymized through the TOR network, padded to a standard packet length and sent at randomized times (along a power-scale distribution), to prevent size and timing co-ordination attacks revealing identity.<p>The network is client-server architectured, but as befits a replacement for e-mail one can run one&#x27;s own server. Everything is open source, written in Go, and the work of Adam Langley, HTTPS security engineer at Google. The CLI is also a standard for aesthetically appealing design.<p>You need to share a symmetric key with every contact to bootstrap trust; feel free to e-mail me (in my profile) if you would like a first contact.<p>[0] pond.imperialviolet.org