Confusion between Reply To and Reply List in email responses

I guess you’re right and the presence of the List-Post header understandably makes Thunderbird think it’s a mailing list email. Probably a Reply-To header would suffice.

The following is from RFC 2369 - The Use of URLs as Meta-Syntax for Core Mail List Commands and their Transport through Message Header Fields

3.4. List-Post

The List-Post field describes the method for posting to the list. This is typically the address of the list, but MAY be a moderator, or potentially some other form of submission. For the special case of a list that does not allow posting (e.g., an announcements list), the List-Post field may contain the special value “NO”.

Examples:

List-Post: mailto:list@host.com
List-Post: mailto:moderator@host.com (Postings are Moderated)
List-Post: mailto:moderator@host.com?subject=list%20posting
List-Post: NO (posting not allowed on this list)

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