Hello, I'm using cPanel on a shared hosting server as a website owner.
I want to setup Google MX for mail, in addition to the built in hosting server mail service for an addon domain.
I'm confused about how DKIM, SPF, and DMARC should be setup in the DNS records between the
- main domain main.com
- addon domain addon.com
- associated subdomain addon.com.main.com
What I currently see by default are 3 pairs of identical DKIM TXT and SPF TXT records for the 3
(edit: upon closer look, it seems the DKIM are different for all 3 types of domain)
- main.com
- addon.com
- addon.com.main.com (in the DNS records for main.com)
What I understand is that I will need to add a second separate DKIM TXT record for Google MX in DNS Editor, in addition to the first DKIM record for the hosting server mail service. And the single SPF TXT record could probably be identical for all types of domains.
1a) What I don't understand is, do I need to create 3 identical Google DKIM TXT records for all 3 types of domains?
(edit: probably they don't need to be the same, as I see now that the default DKIM are not the same)
1b) Similarly, does the 2nd DKIM record for the hosting server mail service need to be identical for all 3 types of domains?
1c) Why is there a DKIM and SPF record for the associated subdomain if there is no MX record for it?
2) If 1a/b is false, if I delete all DKIM and SPF records for the associated subdomain, will this break the addon domain?
3a) I've read somewhere that it's safe to delete the A records for
- addon.com.main.com
- www . addon.com.main.com
in order to stop the associated subdomain from directing browsers to the root of the addon domain, and stop crawlers from looking. Will deleting these A records break anything?
3b) Similarly, if 3a is false, then which of the other A, SRV, TXT records of the associated subdomain can I safely delete, for example
webmail.addon.com.main.com
whm.addon.com.main.com
cpanel.addon.com.main.com
autodiscover.addon.com.main.com
_caldavs._tcp.addon.com.main.com
etc...
Or will deleting some of these break anything?
Several years ago I was using a hosting service that had cPanel and I encountered the same questions, but then they switched to an inhouse software that didn't create associated subdomains for addon domains. Now I'm migrating to a new hosting service that uses cPanel and I don't remember how I resolved these things....
(edit: I looked at the old hoster and they had a hidden panel where they kept the subdomains, which also had its own DKIM and SPF, but doesn't have all the other subdomain records like whm, cpanel, autodiscover, etc.)
Thanks
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