# Calls encryption \[also chatmail relay with Docker\]

**URL:** <https://support.delta.chat/t/calls-encryption-also-chatmail-relay-with-docker/5687>\
**Category:** Mutual Help\
**Tags:** solved, calls, chatmail\
**Created:** [August 24, 2026, 9:23am UTC](https://support.delta.chat/t/calls-encryption-also-chatmail-relay-with-docker/5687 "2026-08-24T09:23:54Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![WofWca](https://support.delta.chat/user_avatar/support.delta.chat/wofwca/32/1702_2.png) [@WofWca](https://support.delta.chat/u/WofWca)\
**Post date:** [August 24, 2026, 1:14pm UTC](https://support.delta.chat/t/calls-encryption-also-chatmail-relay-with-docker/5687/2 "2026-08-24T13:14:20Z")

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> [@bulby](#):
>
> Are the calls encrypted also?

Yes. Calls work on WebRTC, which means that it uses DTLS for encryption.

> [@bulby](#):
>
> How safe they are from man-in-middle attacks?

The signaling messages, which are responsible for exchanging DTLS fingerprints, are sent over the same channel that your regular messages are sent over. Calls are as MITM-secure as this channel is.

> [@bulby](#):
>
> Can I read more about it somewhere?

All you need to read about is how WebRTC works. Delta Chat isn’t doing anything special. [https://webrtcforthecurious.com/](https://webrtcforthecurious.com/) is a nice resource IMO.

> [@bulby](#):
>
> add docker deployment for chatmail relay

See [Chatmail server docker deployment](https://support.delta.chat/t/chatmail-server-docker-deployment/2927).

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