# Do I need to warm up my domain?

**YES**

> A brand-new domain has no reputation, and inbox providers distrust strangers who shout. Ramp volume gradually—and re-warm whenever your provider, IP, or volume changes significantly.

Warming up means progressively increasing your sending volume so inbox providers can build a picture of you as a consistent, trustworthy sender. Reputation is earned over time; a domain nobody has seen before suddenly blasting 50,000 messages looks exactly like what spammers do.

## When it applies

Warm up whenever your sending pattern is about to change materially:

- **New domain**—no history means no trust. Start small: on the order of ~150 emails on day one, roughly doubling toward ~2,000/day by the end of week one, and onward from there.
- **New provider or new IP**—infrastructure changed, so part of your identity did too. An established domain can ramp faster (think 1,000 → 10,000/day over a week), but it should still ramp.
- **A big volume jump**—a product launch or list migration that 10×es your daily send deserves a plan, not a spike.

While ramping, watch two numbers: keep bounces under **4%** and spam complaints under **0.08%**. If either climbs, slow down and find out why before pushing further—the metrics are the warmup.

## When you're already warm

If your domain is established, your volume is steady, and nothing about your infrastructure changed—there is nothing to do right now. Warming up isn't a recurring ceremony; it's how you start and how you respond to change. Consistent good behavior *is* the maintenance plan.

## The spirit of the thing

Warmup schedules are baselines, not physics. The mechanism underneath is always the same: real recipients engaging positively with mail they expected, at a volume that grows smoothly. Start with your most engaged segment, lead with your most-wanted mail, and let the numbers tell you when to accelerate. And whatever you do, don't outsource it to a [warmup service](https://doineed.email/warmup-service).

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- Canonical: https://doineed.email/domain-warmup
- Learn more: https://resend.com/docs/knowledge-base/warming-up
- All questions: https://doineed.email/llms.txt

An opinionated answer from the [Resend](https://resend.com) team.