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Re: MTA (corrected)

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Hi

On 2021-07-05 12:46 p.m., Greg Wooledge wrote:
> 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:
> 
The file I published here was a dump done by Cloudflare some time ago.
Maybe I've modified the records since but I doubt it.

> 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.
Also, I don't think I have such record in my domain (dc-mx) sounds to me
like a Microsoft thing (DC = Domain Controler, MX = Mail Exchange). I
only have a mail. and a MX record.

> 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.
> 

Thanks, yes there's some part that may be different because some of them
are "proxied" by Cloudflare. So if a request is made to Cloudflare DNS
server, they'll give their own server DNS and this will be followed to
my server.

Cloudlfare offer in their free tier a service that will cache your web
pages and offer a fast service because they own many server closer to
the user (edge type service).

The problem is that the free tier is limited and seems to have
limitation that prevent some type of use. This is one of the reason that
pushes me to disable the Cloudflare on my mail domain name. Anyway, I
don't have a website on those domain and Namecheap is responsible of
their own security so no need for acceleration or DDOS on my side.

I'll let know when I did finish changing from Cloudflare to the standard
name management (DNS) offered by Namecheap. I'll see if this fix part of
my problem (like getting 5 DMARC email for every email I respond on the
list).

Thanks,
Sincerely,


-- 
Polyna-Maude R.-Summerside
-Be smart, Be wise, Support opensource development

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MTA Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 15:30 +0200
  Re: MTA Greg Wooledge <greg@wooledge.org> - 2021-07-05 15:40 +0200
    Re: MTA Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 16:00 +0200
      Re: MTA Greg Wooledge <greg@wooledge.org> - 2021-07-05 16:10 +0200
        Re: MTA Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 16:30 +0200
          Re: MTA Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 17:10 +0200
          Re: MTA John Hasler <john@sugarbit.com> - 2021-07-05 17:20 +0200
        Re: MTA Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 16:50 +0200
          Re: MTA Joe <joe@jretrading.com> - 2021-07-05 22:40 +0200
    Re: MTA Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 16:00 +0200
      Re: MTA Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 16:00 +0200
        Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 16:40 +0200
          Re: MTA (corrected) Vincent Lefevre <vincent@vinc17.net> - 2021-07-05 17:10 +0200
            Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 17:50 +0200
            Re: MTA (corrected) Joe <joe@jretrading.com> - 2021-07-05 22:20 +0200
              Re: MTA (corrected) Vincent Lefevre <vincent@vinc17.net> - 2021-07-06 12:00 +0200
          Re: MTA (corrected) Greg Wooledge <greg@wooledge.org> - 2021-07-05 18:50 +0200
            Re: MTA (corrected) Greg Wooledge <greg@wooledge.org> - 2021-07-05 19:10 +0200
              Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 19:20 +0200
                Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-09 22:20 +0200
            Re: MTA (corrected) Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-05 19:10 +0200
    Re: MTA Joe <joe@jretrading.com> - 2021-07-05 22:10 +0200
  Re: MTA Joe <joe@jretrading.com> - 2021-07-05 22:30 +0200

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