Mark Nottingham: > > On 11 Jan 2015, at 8:00 pm, Wietse Venema <wie...@porcupine.org> wrote: > > > > Mark Nottingham: > >> Hi, > >> > >> I?d like to insert SMTP headers and/or body content (e.g., using > >> alterMIME) in outgoing e-mails *if* the SMTP connection to the recipient > >> is not protected by TLS. > >> > >> Is this possible in postfix today, or would it require a change to source? > > > > No, you add the headers with a policy daemon, a Milter, or with > > an SMTP-based content filter.
Or you can use "smtpd_tls_received_header=yes" to show the opposite: this message was received with TLS. Wietse