# Warming up a sending domain

Warmup is the process of increasing sending volume gradually so mailbox providers can observe consistent, wanted mail from your domain.

## Suggested approach

- Start with your most engaged recipients.
- Send predictable daily volume instead of sudden spikes.
- Watch bounces, complaints, unsubscribes, opens, and clicks.
- Pause increases when complaint or bounce rates rise.
- Keep transactional and marketing traffic clearly separated by content and consent.

## OpenSend workflow

Use verified domains, topics, segments, broadcasts, logs, and suppression state to control volume and diagnose issues. For self-hosted deployments, also watch SES quotas and account production access.

## What not to do

Do not buy lists, scrape recipients, or re-mail bounced/complained addresses. Warmup cannot fix poor consent or misleading content.