That is the restriction/feature of the #chatmail accounts, you can only sent encrypted messages. If you want to also send opportunistically[^1] encrypted emails to normal email accounts, then you need to use DC as email client for a normal email account.
https://delta.chat/chatmail
[^1]: this means it is not encrypted until you got the publickey of the other person, but you can still do the qr code scan to get guaranteed e2e encryption that doesn't easily fallback to plaintext
treefit
npub1t0…67d8g
2025-03-06 14:20:05 UTC
in reply to nevent1q…ywqj
Author Public Key
npub1t0n6a852xcq60ke93r06nvt6n2zj6uv2t2nmdngy8mnj5ypkvjzsl67d8gPublished at
2025-03-06 14:20:05 UTCEvent JSON
{
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"pubkey": "5be7ae9e8a3601a7db2588dfa9b17a9a852d718a5aa7b6cd043ee72a10366485",
"created_at": 1741270805,
"kind": 1,
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"content": "That is the restriction/feature of the #chatmail accounts, you can only sent encrypted messages. If you want to also send opportunistically[^1] encrypted emails to normal email accounts, then you need to use DC as email client for a normal email account.\n\nhttps://delta.chat/chatmail\n[^1]: this means it is not encrypted until you got the publickey of the other person, but you can still do the qr code scan to get guaranteed e2e encryption that doesn't easily fallback to plaintext",
"sig": "e17956b7650b72f6641117fc81c761cda831dd139b8b018706b05dca185ef75d1cbf059d35adf0d053c363f0ec006c63eebf81f99fd8cc677e565ef062b863bd"
}