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Delta.Chat

E-mail-based messenger with end-to-end encryption

Delta.Chat is a messenger based on the email protocol.

Delta.Chat will use your mail server set up by SelfPrivacy. If your conversation partner doesn’t use Delta.Chat, it will be just an ordinary email correspondence for him.

Features of Delta.Chat

  • Regular email client with all the features of IM.
  • Reliable end-to-end encryption (e2e), provided a personal email server is used by both interlocutors or a personal key exchange, such as via QR code.
  • Can use any email server, but then you lose control over the meta-information and risk key-swapping man-in-the-middle attack.
  • Slightly slower than usual messengers
  • First message is not encrypted because public encryption keys are sent with it.
  • There are problems with sending files > 5-7MB.
  • There are no convenient channels (chats for mass discussions and sending out information).
Last modified: May 21, 2025