Warm Up New Sending Domains and IPs

New sender infrastructure needs trust built over time. Technical correctness alone is not enough.

Good warm-up habits

  • Start with low, steady volume
  • Send to your highest-quality engaged audience first
  • Keep complaint and bounce rates low
  • Avoid sudden jumps in daily volume

Before you warm up

  • SPF, DKIM, and DMARC are correct
  • PTR and HELO are sane if you manage infrastructure
  • Links and landing pages are production-ready

What slows warm-up down

  • Large cold lists
  • Unstable authentication
  • Constant template or link changes
  • Mixing transactional and marketing traffic carelessly

Reputation improves when volume, consistency, and trust signals move together.