On Sat, 19 Jun 2021 16:23:05 +0100, Jeremy Nicoll wrote:
>
>> Can it [EXTERNAL] be suppressed?
>
>Only if the listserv has configurable Subject editing, I expect ...
>or if it can be forced to reinstate the original subject in every
>reply it sends out. And that would be a problem when the
>discussions go off-topic and people edit the Subject: usefully.
>
It shouldn't be LISTSERV's responsibility, but the originating
client's. And it shouldn't make unconventional modifications
to standard headers. Better to add something such as:
X-Sourrce: EXTERNAL
Or, the client's MUA could flag the message in the local display
triggered by content found in Received: headers.
-- gil
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