References: none

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Hello-

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"?  So that recipient's mail client could
authoritatively know that this email doesn't "thread" with anything else;
as I don't think recipient can be entirely safe in assuming that the lack
of a References/In-Reply-To headers will always mean that it's a new thread
vs the possibility that the sender isn't aware of/properly using those
headers in the rfc2822 sense[1]?  (e.g. maybe some explicit signal like
`References: none`)?

[1]  Gmail, for example, still falls back to threading by subject
<https://webapps.stackexchange.com/questions/965/how-does-gmail-decide-to-thread-email-messages>
when
References/In-Reply-To are absent.

Thanks,

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<div dir=3D"ltr"><div>Hello-</div><div><br></div><div>Is there any standard=
 way for a mail client to tell recipient that &quot;I&#39;m aware of Refere=
nces and In-Reply-To headers but this email is not a reply or related to an=
other email&quot;?=C2=A0 So that recipient&#39;s mail client could authorit=
atively know that this email doesn&#39;t &quot;thread&quot; with anything e=
lse; as I don&#39;t think recipient can be entirely safe in assuming that t=
he lack of a References/In-Reply-To headers will always mean that it&#39;s =
a new thread vs the possibility that the sender isn&#39;t aware of/properly=
 using those headers in the rfc2822 sense[1]?=C2=A0 (e.g. maybe some explic=
it signal like `References: none`)?</div><div><br></div><div>[1]=C2=A0 Gmai=
l, for example, still falls back to=C2=A0<a href=3D"https://webapps.stackex=
change.com/questions/965/how-does-gmail-decide-to-thread-email-messages" ta=
rget=3D"_blank">threading by subject</a>=C2=A0when References/In-Reply-To a=
re absent.<br></div><div><br></div>Thanks,<div><br><div></div></div></div>

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