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A comment on Ask HN: How do some email clients track 'who read' the email?. Parent comment

Re:Ask HN: How do some email clients track 'who read' the em... by epimetheus2 on Monday March 02, 2020 @12:56PM (#22466857)
wouldn't then CC, BCC and TO headers not fit? and emails form different thread, i.e. in gmail?
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Re:Ask HN: How do some email clients track 'who read' the em... by Tomte on Wednesday March 04, 2020 @09:04AM (#22483810)
The headers are totally irrelevant for the actual delivery of the mail. For delivery the so-called envelope is relevant (MAIL FROM, RCPT TO).
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