Subdomain vs root domain for sending
Many email programmes are healthier when promotional or bulk mail is isolated on a subdomain. That does not automatically solve deliverability, but it often makes management clearer.
Why send on a subdomain
A subdomain can isolate reputation, simplify provider setup and avoid mixing high-volume promotional sending too closely with core business correspondence.
When root domain sending still makes sense
Low-volume business mail, executive correspondence and transactional use cases often remain tied to the primary domain for branding and trust reasons.
A practical structure
example.comfor core business mailnews.example.comormg.example.comfor bulk or platform sending- Separate DKIM selectors and DMARC monitoring as needed
How to decide
Think in terms of reputation isolation, operational clarity and how many different platforms send on your behalf.