The Encryption can be removed by a reply with plaintext.
This is quire a security risk next to unencrypted connections maintained in DeltaChat.
Unencrypted Friends needs therefore a special Icon.
Instead of a colored circle with image or initales of the name
the request is to have for unencrypted connections/friends a special icon:
This could be a circle with a black background and a white outer circle line and within a death symbol as a cross, we all know from death announcements in the newspaper.
Thanks for making unencrypted connections more aware.
(†)