Viktor Dukhovni:
> On Tue, Sep 27, 2022 at 06:15:34PM +0000, Eddie Rowe wrote:
>
> > I cannot seem to get the Linux machine's domain name to be used, but
> > instead it is using "localdomain". I took over these duties from a
> > prior employee whose server was "almost ready" has the same issue. So
> > I created test VM and made the minimal changes from the NULL client
> > info shared on the Postfix site. I am using the current version of
> > Postfix that is available from my distribution. This is an internal
> > server for a single domain so nothing fancy. Just took the default
> > main.cf and changed the myorigin = $mydomain, mydestination = ,
> > (nothing after the =), set the relayhost = $mydomain so it would use
> > MX, reloaded the configuration and even restarted the service.
> >
> > Running hostname -f shows the correct fully qualified domain that I
> > expect. So based on the information in the main.cf I think Postfix
> > should use the domain found there.
>
> Your mistake is to use "hostname -f". Postfix uses the actual
> configured hostname, not some randomly canonicalised version
> that changes unpredictably. Either set the system hostname
> to the desired FQDN, or set "myhostname" in main.cf.
>
> > Running postconf -d myhostname returns the host.localdomain where the
> > host is the correct hostname, but localdomain is just the string
> > "localdomain"
>
> You need to configure a fully-qualified hostname, or set myhostname
> explicitly.
The options are:
- Set a FQDN in /etc/hostname (or equivalent)
- Set a FQDN in main.cf:myhostname
- Set main.cf:mydomain
Postfix will not rely on DNS to figure out its domain name, because
it must be able to run when the network is down.
Wietse
Wietse
Postfix must be able to run on a disconnected machine, and
therefore it cannot use DNS to figure out the domain portion of
Wietse
