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Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 07 May 2024 11:43
by exxos
@stephen_usher So what exactly do you think I should have for CNAME for exxoshost and exxosforum ?
I assume exxoshost CNAME should be exxosforum ? And vice versa maybe ?
Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 07 May 2024 12:28
by stephen_usher
The A record should be for the mail domain host with the MX record pointing to it. exxosforum should be a CNAME so that web browsers/servers etc. can find it and use it. A CNAME is basically an alias and normal users won't see any difference than an A record. It would mean, however, that if someone does a reverse look up of the numeric IP address they will always find that specific A record. If you have multiple A records pointing to the same numeric address the reverse look up will find a random one of those names, whatever was in the DNS server's database as the first entry.
Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 07 May 2024 23:07
by stween
Wading into a thread very late, but: is exxoshost.co.uk still the domain you're using for email? The most recent mail I have from your store (which is not super recent!) is from exxoshost.co.uk and the messages upthread suggest this is still the case. That's the domain that mail servers are paying attention to.
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$ dig +short mx exxoshost.co.uk
10 exxoshost.co.uk.
What the IP addresses for this domain map back to in the DNS are the important parts:
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$ dig +short aaaa exxoshost.co.uk.
2a00:d880:11::243
$ dig +short -x 2a00:d880:11::243
exxosforum.co.uk.
The reverse lookup doesn't get you back to the domain you started from.
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$ dig +short a exxoshost.co.uk.
185.52.2.172
$ dig +short -x 185.52.2.172
www.exxosforum.co.uk.
Same, the reverse lookup doesn't get you the domain you started from.
Setting the PTR records for those IP addresses to "exxoshost.co.uk" will align that side of things. I don't think you're using exxosforum.co.uk for any mail?
Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 08 May 2024 12:28
by burn
I have to chime in here.
The last mail I received from exxos contains the following in the header
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Received: from exxosforum.co.uk (www.exxosforum.co.uk [185.52.2.172]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
The sending server is exxosforum.co.uk. This has nothing to do with the sender address noreply@exxoshost
What does not match, is the MX entry for exxoshost.co.uk
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C:\Users\n.huehn>nslookup -type=mx exxosforum.co.uk 8.8.8.8
Server: dns.google
Address: 8.8.8.8
Nicht autorisierende Antwort:
exxosforum.co.uk MX preference = 10, mail exchanger = exxosforum.co.uk
C:\Users\n.huehn>nslookup -type=mx exxoshost.co.uk 8.8.8.8
Server: dns.google
Address: 8.8.8.8
Nicht autorisierende Antwort:
exxoshost.co.uk MX preference = 10, mail exchanger = exxoshost.co.uk
The MX entry for exxoshost.co.uk must also be exxosforum.co.uk.
This is because the receiving server checks which server the mail is coming from. Checks the MX of the domain of the sender address to see if it matches the sending server. And it doesn't do that here.
Unfortunately, there are a lot of little things that need to be done to ensure smooth mail server operation.
Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 08 May 2024 15:15
by exxos
The mail should be coming from exxosforum. But this will be only valid for store orders as the forum uses idnet mail server currently. Exxoshost accounts for the store receipts i changed for exxosforum accounts, but maybe I forgot to change the no reply address from exxoshost. But I didn't think it would matter anyway.
I find all the mx and cname stuff a bit puzzling. I've got 4 domains using the same mail server. Sometimes I send from a exxoshost email but i think I gave up with thunderbird and just used the servers IP rather than any domain names.
Maybe I can send the DNS records to one of you guys to tell me what I need to change with it all ?
Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 08 May 2024 15:39
by stween
Ah ok, if exxosforum.co.uk is the domain being used for mail, then:
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$ dig +short a exxosforum.co.uk.
185.52.2.172
$ dig +short -x 185.52.2.172
www.exxosforum.co.uk.
^ change the PTR (reverse) record for 185.52.2.172 to 'exxosforum.co.uk.', i.e., not www
and:
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$ dig +short aaaa exxosforum.co.uk.
2a00:d880:11::243
$ dig +short -x 2a00:d880:11::243
exxosforum.co.uk.
^ this looks okay.
@burn is probably right also on setting the mx record for exxoshost.co.uk to "exxosforum.co.uk". Or, update the noreply address to noreply@exxosforum
If no email address you're using points to exxoshost.co.uk, doesn't originate from exxoshost.co.uk, etc, there's no need for anything to query for exxoshost.co.uk's MX record, you could just remove the MX record entirely.
Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 08 May 2024 15:49
by exxos
Ok thanks I'll have a look when I get back home tomorrow.
I still have a lot of exxoshost email accounts in use, but they for my suppliers and such.. there's 2 or 3 other domains which may need tweaking also :roll:
Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 08 May 2024 21:14
by exxos
stween wrote: 08 May 2024 15:39
^ change the PTR (reverse) record for 185.52.2.172 to 'exxosforum.co.uk.', i.e., not www
The only place www is in the CNAME, and it wants me to put something in that box. AAAA has @ not www. But apparently without www as an alises the domain
www.exxoshost.co.uk would stop working.. So I don't get whats its supposed to be.
I just envision if I use CNAME as exxosforum for all my domains, that me other domains will end up screwing up and doing to exxosforum also.. my 2 other domains are nothing to do with exxoshost or exxosforum, so I just see it all screwing up if I mess with it :(
The noreply address is already exxosforum it seems. So that likely changed some months ago.
EDIT:
On, it was in the server control panel. I've just changed that.
Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 08 May 2024 21:21
by exxos
burn wrote: 08 May 2024 12:28
The MX entry for exxoshost.co.uk must also be exxosforum.co.uk.
This is because the receiving server checks which server the mail is coming from. Checks the MX of the domain of the sender address to see if it matches the sending server. And it doesn't do that here.
I've changed all the MX records to exxosforum.
Will have to wait a a few hours see if anything breaks before doing anything else.
So should CNAME be exxosforum for all my domains then ?
Re: My fight against Microsoft Outlook hotmail etc email blocking
Posted: 09 May 2024 00:01
by stween
exxos wrote: 08 May 2024 21:14
stween wrote: 08 May 2024 15:39
^ change the PTR (reverse) record for 185.52.2.172 to 'exxosforum.co.uk.', i.e., not www
On, it was in the server control panel. I've just changed that.
Looks fixed:
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$ dig +short -x 185.52.2.172
exxosforum.co.uk.
exxos wrote: 08 May 2024 21:21
I've changed all the MX records to exxosforum.
Alright:
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$ dig +short mx exxoshost.co.uk
10 exxosforum.co.uk.
$ dig +short mx exxosforum.co.uk
10 exxosforum.co.uk.
exxos wrote: 08 May 2024 21:21
So should CNAME be exxosforum for all my domains then ?
I see two CNAMEs: one from
www.exxosforum.co.uk to exxosforum.co.uk, and another from
www.exxoshost.co.uk to exxoshost.co.uk. Neither seem related to your mail setup, and you're already issuing an HTTP-layer redirect for web traffic that arrives at exxoshost.co.uk. Seems fine to me.