How do you migrate safely from root to subdomain sending?
Setup:
- Create subdomain DNS records
- Configure SPF, DKIM, DMARC for subdomain
- Set up ESP to send from subdomain
- Test authentication thoroughly
Warmup:
- Begin subdomain warmup with small volume
- Use most engaged segments
- Follow normal warmup schedule
Traffic migration:
- Gradually shift traffic from root to subdomain
- Start with certain campaign types
- Monitor subdomain performance
Completion:
- All applicable traffic on subdomain
- Root domain reserved for transactional or deprecated
- Update any customer-facing references
- Opening a new office while gradually transferring operations from the old one.
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