On Lu, 10 feb 20, 10:36:18, peter@easthope.ca wrote: > > Given that References includes the In-Reply-To identifier, I'm not > sure In-Reply-To is necessary for threading. Without In-Reply-To a mail reader has no way to which message the reply belongs, so it's more important than References. Kind regards, Andrei -- http://wiki.debian.org/FAQsFromDebianUser
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