It is tempting to hit reply to an existing email or thread post, change the subject, and send it off.
Unfortunately, the headers in most instances contain thread information, so the reply may still be misplaced into other threads.
Please start a new email with a new subject. All you need online is to start a "new post", and if you are using email, as I am, then simply start a new email. The only thing you need that is extra, when compared to a reply, is to insert the To field. I just copy that from an existing email in the same forum, and paste to the To field, add a subject and hash tags, and off I go.
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73 de Rich NE1EE
On the banks of the Piscataqua