@stavpup Delta Chat enforces end-to-end encryption by default, and it's deep down the advanced relay settings to disable it. If you want to use classic unencrypted email with people it's usually better to use a classic email app. However, you can use Delta Chat with classic email addresses for encrypted messaging just fine but see https://delta.chat/en/help#can-i-use-a-classic-email-address-with-delta-chat for notes.