Reminder: There are no accounts in the classic sense anywhere with #chatmail or #deltachat.

It's all private profiles on end user devices which co-ordinate in a #p2p fashion. Chat profiles *use* email (relay) addresses for transporting messages through a federated e2ee-restricted SMTP network.

A chat profile or chat group has zero data on the server. It's radically different from classic email servers, Whatsapp, Signal, XMPP and Matrix servers which host and control chat identity.