Let us say, i am sending a message from a Delta-Chat App, but the peer do not have Delta-Chat App, therefore peer will receive the message into their regular email.
Is there a way to know if the message indeed reached to their Delta-Chat App or to an Email-Client?
Also, if the peer has sent me a message from an Email-Client, how would i know that this message has come from Email-Client or Delta-Chat App?
No because normally email clients don’t send anything back. However, if you see double checkmark, this means your message has been read in Delta Chat and Delta Chat sent back a read receipt.
Delta Chat adds a Chat-Version: 1.0 header to show that it is a chat message.
Thanks @link2xt for your response.
Double tick is a good trick. I also found following:
if No, Chat Only is configured, we won’t get any messages originated from email.