Your organization might use subdomains for certain business purposes. For example, if your domain is solarmora.com, you might send email from a subdomain called mail.solarmora.com. Or, you can use a subdomain for tech support information, for example support.solarmora.com.
Some domain providers let you add a DKIM TXT record directly to the subdomain, using the same steps in Turn on DKIM for your domain.
If your domain provider doesn't let you add TXT records to a subdomain, add a modified TXT record to the parent domain. This enables DKIM for the subdomain.
Step 1: Get the DKIM TXT record name and key value for the parent domain
To get the TXT record name and DKIM key value, follow the steps in Generate a DKIM key for your domain.
Important: The subdomain must be for the domain you select in your Admin console, in the Selected domain menu on the Email authentication page.
Step 2: Modify the TXT record name
Modify the TXT record name from the Admin console, so it can be used for a subdomain. To modify the TXT record name, add a period (.) followed by the subdomain name to the end of the TXT record name.
For example, if your subdomain is mail.solarmora.com:
In this example, your subdomain is support.solarmora.com:
Step 3: Add the modified TXT record & DKIM key to the parent domain
Log into your domain provider and add the DKIM information from Steps 1 and 2:
Keep these tips in mind:
- TXT record limits: Some domain providers limit TXT record length. If yours does, read TXT record limits and DKIM keys.
- DKIM can take up to 48 hours to start: After adding a DKIM key, it can take up to 48 hours for DKIM authentication to start working.
- Multiple domains: If you’re setting up DKIM for more than one domain, complete the steps below for each domain. You must get a unique DKIM key from the Admin console for each domain.
For help with your domain sign-in information, settings, or TXT records, contact your domain provider. For example, if Google Domains is your domain provider, get help here. Google doesn't provide technical support for third-party domain providers.
- Sign in to the management console for your domain provider.
- Locate the page where you update DNS records for your domain.
- Add a TXT record for DKIM:
- In the first field, enter the modified TXT record name.
- In the second field, enter the TXT record value (DKIM key) from your Admin console.
- Save your changes.