The domain warmup guide that prevents you from burning domains on day one.
New domains have zero reputation. Send too much too fast and you're in spam permanently. This guide walks you through the 14-day protocol that builds real sender reputation.
Why you can't skip warmup
Inbox providers treat new domains like unknown senders -- because that's what they are. Gmail, Outlook, and Yahoo use sender reputation algorithms that take weeks to build trust. Skipping warmup or rushing it means your first real campaign emails go straight to spam, your domain gets flagged, and you're starting over. The 14-day protocol in this guide is what we use for every client. It works.
What's in this guide
- Pre-warmup checklist: domain purchase, DNS configuration, mailbox setup
- SPF, DKIM, and DMARC setup instructions with verification steps
- Day-by-day volume ramp schedule (days 1-14)
- Engagement simulation: what it is and why it matters
- Provider-specific notes for Gmail, Outlook, and Yahoo
- Seed testing checkpoints: when and how to verify placement
- Red flags: how to spot warmup problems before they become permanent
- Post-warmup transition to live campaign sending
Where to go from here
Once your domains are warmed, you need to maintain deliverability. Our Deliverability Guide covers ongoing monitoring and maintenance. Our Email Infrastructure Guide covers the full sending stack setup. Or let us handle warmup and infrastructure entirely -- we do it for dozens of clients every month.
Frequently asked questions
Can I warm up a domain faster than 14 days?
We don't recommend shortcuts. Protocols under 14 days produce unstable reputation that craters when you start sending real volume. 14 days is the floor for reliable inbox placement.
How many emails should I send during warmup?
Start at 5-10 per inbox per day and ramp to 30-50 by day 14. The exact curve depends on the provider and inbox age. Our guide includes the full day-by-day schedule.
Should I use a warmup tool or do it manually?
Warmup tools automate the process, but shared warmup pools are increasingly detected by inbox providers. The best approach is a private warmup network -- which is what we use and recommend.
What if my domain gets flagged during warmup?
Pause sending immediately. Check DNS authentication, review warmup volume, and run a blocklist scan. If the domain is salvageable, reduce volume and extend the warmup period. If it's flagged on major blocklists, retire it and start a new one.
Let us warm your domains for you.
Book a call and we'll set up and warm your sending infrastructure while you focus on your business.