Re: [tlug] [slightly OT] SMTP and the internet, protocols and the internet

["Schwartz, Fernando G. | @SCA" <fgs@example.com>]

On 1/11/21 1:54 PM, Christian Horn wrote:
> I thought I had seen an issue, but it looks ok to me.
> I had seen 'dig -x 45.136.30.123' returning 'fc' instead of
> 'fluxcoil.net', turns out that is a "feature" of
> systemd-resolved.
>
> Since Fedora33 it is default.  I have
>    nameserver 127.0.0.53
> in /etc/resolv.conf, and requests like done with 'dig' are
> running through systemd-resolved.  The "feature" is that it
> used an entry like
>    45.136.30.123 fc
> in /etc/hosts to return then "fc".. interesting.
> But I'm not sure what they think how rDNS should be broken.

... The machine " FQDN " must be " fluxcoil.net ". That's what the 
website test error refers to.

BTW, for [f]ully [q]ualified [d]omain [n]ame of the host machine, I'd 
recommend:

< some name for the machine > + < domain name >. Therefore, not just " 
fluxcoil.net " but rather, let's say, " mail.fluxcoil.net ".

Keep us posted! フェルナンド