In article
<CABHfyPSGFveB+_8UGUTFjuqab2-9UVKSJggGWinTxrwKijM-pw(_at_)mail(_dot_)gmail(_dot_)com>
you write:
Is there any standard way for a mail client to tell recipient that "I'm
aware of References and In-Reply-To headers but this email is not a reply
or related to another email"?
The short answer is no.
It might be interesting to put the message's own message-id in the
references and reply-to header and see what happens.
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