bug#25436: 25.1; sendmail does not add a Date: header in FCC

[Eli Zaretskii]

> Date: Fri, 13 Jan 2017 15:15:23 +0100
> From: Francesco Potortì <pot@gnu.org>
> 
> When mail-user-agent is set to 'sendmail-user-agent, email saved to FCC
> files does not include a Date: header.

Works for me here, so some other factor is at work in your case.

Can you produce a full recipe, starting with "emacs -Q", and including
the necessary customizations of mail-related variables, until you can
send a message which exhibits this problem?  I'd like to compare that
with what I have here.

Thanks.