Poliman - Serwis:
> 2018-11-13 16:05 GMT+01:00 Kris Deugau <kdeu...@vianet.ca>:
>
> > Poliman - Serwis wrote:
> >
> >> Hello. I have used G Suite MX checker available here
> >> https://toolbox.googleapps.com/apps/checkmx/
> >>
> >
> > This seems to be a Google-specific tester for domains hosted with Google,
> > so it's difficult to compare with random other domains.
> >
> > and I have message: "The address of the mail server in the domain record A
> >> can cause poorly visible and difficult to diagnose errors manifested by
> >> "disappearing" e-mails in the event of problems with the DNS server. This
> >> problem can be diagnosed by entering a command*telnet your.do.main
> >> 25*[..]". How can I resolve this?
>
> It's colonel.com.pl. Please check. I don't see anywhere MX's IP as A record
> in dns zone.
You have both A and MX records for colonel.com.pl. Some SMTP systems
may try to send email using the A record, if those SMTP systems are
borked and if their DNS resolver is borked.
Wietse
