self-host

Beeper already advertises the self-hosting route: https://github.com/beeper/self-host

All messages are encrypted by the bridge before being sent to the matrix homeserver. Homeserver cannot read or see any message contents. If you want to self host everything, including the homeserver, you can do this: https://github.com/beeper/self-host

I don't think Beeper can promise end to end encryption for 3rd party services either. Fundamentally if you're interfacing with a service like iMessage or Whatsapp - even if they offer end to end encryption - the message has to be decrypted and then sent to the 3rd party app. Unless that gateway is running on your phone, the messages have to be decrypted in the cloud somewhere. At that point, you are placing all your trust in the 3rd party app's cloud services. Obviously they can still make better decisions than these guys - don't write confidential data to your logs! Don't unencrypted HTTP APIs! But unless the gateways to the 3rd party services run locally, you will never have end to end security. Edit: Beeper has published their bridges as open source, so you could self-host it. That would at least give you full control of the stack. htt

They have a self-hosted instruction here : https://github.com/beeper/self-host However, as it is stated, you can't use Beeper to connect to a self-hosted server. You must use other Matrix client such as Element.