Re: resolving addresses in smtpd and T-mobile addresses I login on with SSH being used

On Tue, Dec 03, 2019 at 04:41:27PM GMT, Chris Bennett wrote:
> I have been fixing some problems with emails between two of my servers.
> At the time I had /etc/hosts file empty except for localhost.
>
> While sending emails, I got several of errors in maillog like these:
>
> Dec 2 22:36:28 freedomforlife smtpd[78001]: cd3e9bc4ab696630 smtp connected address=172.58.46.253 host=<unknown>
> Dec 2 22:36:28 freedomforlife smtpd[78001]: cd3e9bc4ab696630 smtp failed-command command="" result="550 no rDNS is so 80s"
> Dec 2 22:36:28 freedomforlife smtpd[78001]: cd3e9bc4ab696630 smtp disconnected reason=quit
>
> 172.58.46.253 is an IP for T-mobile. Which I use the WiFi hotspot to use SSH from.
> This was a previous IP I had used before, not on the session in progress.
> I found several other T-Mobile addresses being used in maillog that were not current sessions.
>
> I don't know what to make of this. I rebooted both servers after emptying /etc/hosts.
>
> resolv.conf has:
>
> lookup file bind
> nameserver 8.8.8.8
> nameserver 8.8.4.4
>
> on this server.
>
> What is going on here? How could this possibly be happening?
>
> Chris Bennett
>

Hi Chris,

Is rdns anywhere in your smtpd.conf? You forgot to attach, so only
guessing here...

Regards,

Raf