On Mon, Jan 11, 2021 at 12:18:15PM -0500, Harry wrote:

> Where can I find real examples of /etc/postfix/main.cf setup on host
> with no resolvable FQDN relaying throu smtp Smarthost with
> authentication?

    http://www.postfix.org/SOHO_README.html
    http://www.postfix.org/SOHO_README.html#fantasy

> reader > sendmail -vt <tmail.txt
> Mail Delivery Status Report will be mailed to <reader>.
>                                                                       
> I tried tmail as shown, and with `From: ' field like this:
>    From: rea...@newsguy.com  (which is a working email address) 

The "From:" header has no bearing on the return path of email,
which comes from the message envelope.  You can set with the
"-f sender" option of sendmail(1).

> Even though the sendmail message says reports will be mailed, nothing
> shows up at /var/spool/mail or at rea...@newsguy.com

the fate of the probe report is in your logs.  If your system is
configured to relay all mail to a smarthost, then that's where
the notice would have been routed to.  Actual delivery requires
a working configuration.

If you configure a domain for local delivery, and use an address
in that domain as the envelope sender, then probe status reports
will be delivered locally.

    mydestination = localhost.local

  $ sendmail -f root@localhost.local -bv postmaster@some.where

-- 
    Viktor.

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