Ankur asked,
Is there any way I can add the header 'In-Reply-To' to the mail before
hitting the Mailman using formail.
Yes, but the difficult parts for the software are figuring out whether
the message actually is a reply and should have an In-Reply-To: header
in the first place, and if so, finding which previous post it's
answering. If the respective answers are "its subject starts with
`re:'" and "it will be the most recent preceding post with the same
subject modulo `re:'," then that is mere subject grouping, which any
mail client should be able to do already.
DWT, posting in the morning before hitting the mailman
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