On 4/17/2023 9:19 PM, tom--- via Postfix-users wrote:
I saw many peer MTA connecting me with this default HELO hostname:
localhost.localdomain.
is this a FQDN? is it valid?
Yes, it's FQDN and valid from a syntax standpoint.
That said, it's a strong spam indicator and should never be seen
On Tue, Apr 18, 2023 at 10:19:58AM +0800, tom--- via Postfix-users wrote:
> I saw many peer MTA connecting me with this default HELO hostname:
> localhost.localdomain.
>
> Is this a FQDN?
Yes, it is a fully-qualified domain name.
> Is it valid?
Depends on your perspective. This FQDN does not
On 4/17/23 22:19, tom--- via Postfix-users wrote:
I saw many peer MTA connecting me with this default HELO hostname:
localhost.localdomain.
is this a FQDN? is it valid?
No properly configured MTA should ever be advertising its identity as
localhost.localdomain. Assuming it is that literal
