--subject Specify the initial "Subject:" line.
--in-reply-to Specify the first "In-Reply-To:" header line.
--chain-reply-to If set, the replies will all be to the previous
--subject Specify the initial "Subject:" line.
--in-reply-to Specify the first "In-Reply-To:" header line.
--chain-reply-to If set, the replies will all be to the previous