Dib2Qm (aka Dibdib Messenger)

Messenger for secured chats and groups (end-to-end encrypted).

Dib2Qm is a messenger that works via e-mail servers, end-to-end encrypted.

Currently only as experimental version! Some of the following features are
not supported yet.

Text messages are not only end-to-end encrypted, they also get stored on your
device in an encrypted way. Images, attachments etc. can be sent -- encrypted,
of course, but since they depend on third-party programs, they are stored
une