Add additional domains
Introduce new sending domains without starving or contaminating existing warm identities.
Objective
Scale sending safely
Increase sending volume on an already warm identity without triggering filters.
Starting state
Existing warm domain(s); need more sending identities
Prerequisites
- Clear stream separation plan
- Warmup capacity
Estimated time
2–4 hours
Difficulty
advanced
Required access
- DNS
- ESP
- CRM
Inputs
- New domains
- Which streams move
- Ramp schedule
Step-by-step instructions
- Define purposeAssign each new domain a stream (e.g. marketing vs lifecycle).
- Authenticate and warmComplete auth and a dedicated warmup before moving meaningful volume.
- Migrate traffic graduallyShift cohorts in slices; keep the original domain healthy as fallback.
Verification
- New domain metrics stable before next slice moves
Common mistakes
- Park all volume on a brand-new domain overnight
- Share IPs across domains or isolate?
Rollback / recovery
- Return traffic to the prior warm domain
Expected outcome
Additional domains carry planned streams without burning them.
When to escalate
- New domain filtered while old domain remains healthy