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I am just learning about read receipts. I wonder how to identify whether a mail is read receipt response or normal reply?
I surfed the internet and got some header from RFC. Are those the only way to identify them. Is it possible for a read receipt response to be without these headers. If so, how to identify that it is a read receipt response.

Thanks.

Sneftel
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Ahamed Yasir
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  • If something lacks those headers then it is not a well-defined read receipt. Second guessing if something might still try to be something when it is not seems pointless, and slightly superstitious. – tripleee Feb 10 '20 at 12:42

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