On 09.09.24 11:54, Walter Alejandro Iglesias wrote:
> 
> Anyway, my slightly related question was: how did you managed to include
> a In-Reply-To header using a plain smtpd(8) command ('sendmail -t').
> 

By copying the message id from the archive into vi(1) and writing it by
hand. sendmail(8) adds missing message-id and date headers.

-- 
Christian