Privacy

Chatmail servers (stripped down email servers that run faster than traditional mail servers and allow only encrypted email, basically eliminating spam) are free to use. You don’t need to use a traditional email provider and delta chat devs encourage chatmail servers instead. (By default you are onboarded on a chatmail server)

These still use the email protocol, making them hard to block by govs, but act more like relays as they only store the messages while in transit.