slackbuilds/network/deltachat-desktop

Delta Chat is a chat app that sends messages via e-mails, encrypted
if possible, with Autocrypt. You do not have to sign up anywhere, just
use your existing e-mail account with Delta Chat.

Features:

* Interactive web apps in chat for gaming and collaboration.
* Reliable instant messaging with multi-profile and multi-device support.
* Audited end-to-end encryption safe against network and server attacks.
* FOSS software, built on Internet Standards, avoiding xkcd927.
* Creation of a groups.
* Multi-client.
* Support Experimental of audio/video calls.