On Mon, Jul 05, 2021 at 01:00:07PM -0400, Polyna-Maude Racicot-Summerside wrote: > On 2021-07-05 12:46 p.m., Greg Wooledge wrote: > > unicorn:~$ host _dc-mx.f1202d9a4fb3.cyrania.com. > > _dc-mx.f1202d9a4fb3.cyrania.com has address 162.213.253.79 > > Host _dc-mx.f1202d9a4fb3.cyrania.com not found: 3(NXDOMAIN)
> What you wrote (dc-mx) is not a underscore. Is your mail user agent doing some sort of markdown processing, by chance? Maybe you aren't seeing what's actually being written. If that's the case, it's only adding to your problems. The output of "host -t mx cyrania.com." on my machine includes a hostname that begins with an underscore. underscore dee cee hyphen em ex. This hostname (including its leading underscore) appears on each of the three lines in the quoted text above. If you aren't seeing it, then something's wrong. If you doubt my output, go ahead and run your own tests, on a machine under your own control.
