Re: MTA (corrected)

[Greg Wooledge <greg@wooledge.org>]

On Mon, Jul 05, 2021 at 10:32:27AM -0400, Polyna-Maude Racicot-Summerside wrote:
> This is a copy of the dump of my domain name config for CYRANIA.COM
> 
> -------START
> 
[snip]

> cyrania.com.	1	IN	A	162.213.253.79

> ;; MX Records
> cyrania.com.	1	IN	MX	0 mail.cyrania.com.

> cyrania.com.	1	IN	TXT	"v=spf1 +ip4:162.213.253.79
> +include:spf.web-hosting.com +ip4:198.54.120.203 ~all"

These are not the publically visible DNS records for your domain.


unicorn:~$ host cyrania.com.
cyrania.com has address 104.21.59.235
cyrania.com has address 172.67.185.109
cyrania.com has IPv6 address 2606:4700:3031::6815:3beb
cyrania.com has IPv6 address 2606:4700:3031::ac43:b96d
cyrania.com mail is handled by 0 _dc-mx.f1202d9a4fb3.cyrania.com.

unicorn:~$ host -t mx cyrania.com.
cyrania.com mail is handled by 0 _dc-mx.f1202d9a4fb3.cyrania.com.

unicorn:~$ host -t txt cyrania.com.
cyrania.com descriptive text "v=spf1 +ip4:162.213.253.79 +include:spf.web-hosting.com +include:premium58.web-hosting.com +ip4:198.54.120.203 ~all"


The SPF record is pretty close, but the others are nowhere near.

It's also particularly disturbing that your MX record contains an
underscore.  I've been led to believe that's disallowed in hostnames.
Attempting to resolve it gives me this error:

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)

Whether that's because of the underscore is unclear to me.

In any case, you're going to want to find out why your publically visible
DNS records don't match what you thought they should be.