This may appear obvious, but be aware that when you start a note to a person by simply selecting an email address, you are not replying, even if you copy or construct an appropriate subject line. Therefore extract the address from the headers (select the address character and then do VO space and choose "Copy address"), reply as usual, and wipe out any recipients and paste in your copied address. Your reply will then show up at the recipient as directed to them but still be on the same thread as it originated.
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