Hi Mea
see answers in line
On 23/12/2025 23:31, Mea Para via Postfix-users wrote:
Hello,
In main.cf, the variable inet_interfaces demands an IP address. I say demand,
because if I supply the name of the interface, postfix check returns the
following error:
Postfix is not demanding an ip address. It is requiring values as per
the documentation, potentially ones which are not ip addresses:
https://www.postfix.org/postconf.5.html#inet_interfaces
postfix: fatal: config variable inet_interfaces: host not found: em0
There are two problems with this.
1. The error message says "host not found". This means that "em0" is treated by "postfix
check" as if it were a host name. Since the variable inet_interface is asking for a network interface name, the
"postfix check" should check whether it corresponds to a network interface, not to a host name.
The parameter requires a value in line with the documentation (see
above). It is not requiring a network interface name.
2. If I supply an IP address, "postfix check" accepts it. However, an IP
address is not a network interface, hence the check should fail.
The check does not fail in this case since it is aligned with the
documented behaviour.
I understand that an IP address is what it has been taking for decades, but can
we use the name of a network interface without incurring in this error?
Not sure if that is technically feasible, but I am even less sure about
what benefit that would bring and what problem you want to solve with
this change.
John
Thank you
--
Mea
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