On Sun, Mar 22, 2026 at 07:33:15PM -0400, Scott Hollenbeck via Postfix-users 
wrote:
> I'm setting up a new server running Ubuntu 24.04.4 LTS and postfix 3.8.6.
> I'm having trouble getting postfix properly configured to send email from
> the server's domain name (dnsmon.net). As currently configured, email is
> identified as being sent from the server's host name (juno). This is what I
> see in the headers of a received message:
> 
> Return-Path: <sah62@juno>
> From: Scott Hollenbeck <sah62@juno>
> 
> Here are the configuration values returned from "postconf -n":
> 
> myhostname = dnsmon.net
> myorigin = /etc/mailname
> 
> ...and a few other relevant values:
> 
> $ cat /etc/mailname
> dnsmon.net
> 
> $ cat /etc/hostname
> juno
> 
> I don't yet have a valid PTR record set for this new server. Could that be
> the problem? Is there something else I'm missing?

Please see: https://www.postfix.org/DEBUG_README.html#mail
In particular, the above post lacks:

    - A clear, non-anecdotal report of the observed symptoms,
    - Some relevant log entries,
    - Full configuration details (postconf -nf, postconf -Mf)

-- 
    Viktor.  🇺🇦 Слава Україні!
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