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I purchased a domain from Google Domains, say, mydomain.tld. I do not plan to have any hosting/content on this domain as of now. I'm not using any external services or providers, just Google Domains and GMail.

I added the alias hello to my email forwarding settings in Google Domains. Now, any emails sent to hello@mydomain.tld get forwarded to my own GMail address.

Instead, I would like to use a subdomain for my alias, such as hello@abc.mydomain.tld (note the extra abc subdomain).

I originally had MX records for the base domain, so I cloned them to the subdomain as well.

Original record:

domain.tld  MX  1 hour  
5 gmr-smtp-in.l.google.com.
10 alt1.gmr-smtp-in.l.google.com.
20 alt2.gmr-smtp-in.l.google.com.
30 alt3.gmr-smtp-in.l.google.com.
40 alt4.gmr-smtp-in.l.google.com. 

Cloned record:

abc.domain.tld  MX  1 hour  
5 gmr-smtp-in.l.google.com.
10 alt1.gmr-smtp-in.l.google.com.
20 alt2.gmr-smtp-in.l.google.com.
30 alt3.gmr-smtp-in.l.google.com.
40 alt4.gmr-smtp-in.l.google.com. 
I do see this error message on intoDNS.com - are those related?
Error   Reverse MX A records (PTR)  ERROR: No reverse DNS (PTR) entries. The problem MX records are:
14.9.251.142.in-addr.arpa -> no reverse (PTR) detected
14.157.250.142.in-addr.arpa -> no reverse (PTR) detected
14.150.250.142.in-addr.arpa -> no reverse (PTR) detected
You should contact your ISP and ask him to add a PTR record for your ips 

If not, what am I missing? How do I get email forwarding working with my subdomain?
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  • From ServerFault: Create MX Record for Subdomain and MX Record for SubDomains Jul 3 at 9:38
  • You can create a new MX record for abc.mydomain.tld and point the record to your server (you can refer to mydomain.tld's record).
    – CHOO YJ
    Jul 3 at 10:13
  • @CHOOYJ that's what I figured. I cloned the entries from the original MX record for the domain, as an entry for the subdomain. Doesn't seem to change anything.
    – metacubed
    Jul 3 at 10:35
  • @CHOOYJ updated my question to add relevant details
    – metacubed
    Jul 3 at 10:40
  • @StephenOstermiller I do have MX records for the subdomain, cloned from the original record. See updated question.
    – metacubed
    Jul 3 at 10:41
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My observation, as a web host who sets up google workspace for many customers, is that intoDNS always returns that error for anyone using google servers for their MX records

Here's an example...

enter image description here

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  • Thanks for confirming, @Steve. I'm still not receiving any emails on my subdomain, though.
    – metacubed
    Jul 3 at 22:41
  • Do you have an A record for the subdomain?
    – Steve
    Jul 3 at 22:46
  • I don't, there's no content hosted on the site, so there's no IP address to point at.
    – metacubed
    Jul 4 at 0:04

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