If you already have a verified root domain on your account, you can add subdomains under it — like mail.yourdomain.com or work.yourdomain.com. Each subdomain can then be used on aliases independently.
Why use a subdomain
Subdomains are useful for separating alias groups by purpose. Some examples:
personal.yourdomain.comfor personal aliaseswork.yourdomain.comfor professional onespromo.yourdomain.comfor newsletters and sign-ups
It keeps your main domain clean while still using your own branding.
Adding a subdomain
Go to Domains and click Add Domain, then choose Add Subdomain. You'll be asked to select which verified root domain to add the subdomain under, then enter the subdomain prefix.
The subdomain only needs one DNS record — an MX record. SPF, DKIM, and DMARC are inherited from the parent domain, so you won't need to add those separately.
DNS record for a subdomain
Add an MX record to your DNS with:
- Name: the subdomain (e.g.
mailformail.yourdomain.com) - Type: MX
- Value: provided on the setup page
- Priority: as shown on the setup page (usually 10)
Once propagated, click Verify DNS on the setup page to confirm it's working.
Using a subdomain on aliases
Once the subdomain is active, it appears in the domain selector when you create a new alias. Aliases on subdomains work exactly the same as those on root domains.
Removing a subdomain
The same rules apply as removing any domain — see Removing a domain. Aliases on the subdomain stop working once it's removed.