Hi,

Some months ago I posted this patch:

  https://marc.info/?t=169616631000001&r=1&w=2

It was originally intended to add MIME headers to mail(1), but in the
process I added other functionalities, also headers related.

To facilitate the review now I split that diff in the first two below,
and added a third one which solves some Subject issues[*].  They must be
applied in the given order.

  1.  Message-ID, In-Reply-To and User-Agent:

     https://en.roquesor.com/Downloads/MailOpenBSD/mail_message-id_1.diff

  2.  MIME headers:

     https://en.roquesor.com/Downloads/MailOpenBSD/mail_mime_2.diff

  3.  Process Subject: wrap lines longer than 76 columns and base64
      encode valid UTF-8:

     https://en.roquesor.com/Downloads/MailOpenBSD/mail_b64subject_3.diff


(*) mail(1) doesn't do any process with the Subject, it doesn't wrap it
at less of 76 columns, it doesn't remove control characters, it doesn't
add a leading space when a subject contains a new line, what makes smtpd
to cancel the delivery and print an error message:

  $ echo Hello | mail -s "$(printf 'Hello\nWorld')" <local_user>
  sendmail: command failed: 550 5.7.1 Delivery not authorized, message refused: Message is not RFC 2822 compliant



P.S.: Tomorrow I have surgery on my leg, so in case someone is
interested in my patches this time, keep in mind that it'll probably
take me a while to respond and deal with this.


-- 
Walter