If you’ve just registered a new domain or IP address and you’re about to send bulk email campaigns, you’re about to make one of the most common — and costly — mistakes in email marketing: sending at full volume from day one.
Without a proper warmup, Gmail, Outlook, and Yahoo will flag your domain as suspicious and route your emails straight to spam. This guide explains why domain warmup matters and how to do it correctly.
What Is Domain Warmup?
Domain warmup (also called IP warmup) is the process of gradually increasing your sending volume over several weeks so that email service providers (ESPs) like Gmail and Outlook learn to trust your domain as a legitimate sender.
When a new domain starts sending email, inbox providers have no reputation data on it. To protect their users, they apply strict filtering to unknown senders. A warmup period builds a positive sending history — step by step.
Why Domain Warmup Matters
- Sending volume consistency — sudden spikes look suspicious
- Bounce rate — high bounces signal a poor-quality list
- Spam complaint rate — above 0.1% will hurt your reputation fast
- Engagement rate — opens and clicks signal recipients want your mail
A Typical Domain Warmup Schedule
- Week 1: 100–500 emails/day
- Week 2: 500–2,000 emails/day
- Week 3: 2,000–10,000 emails/day
- Week 4: 10,000–50,000 emails/day
- Week 5+: Scale to full volume
Authentication Is Non-Negotiable
Before you start warming up, make sure your domain has proper email authentication: SPF, DKIM, and DMARC. Without these, no warmup will save you.
How MailPipe Handles Domain Warmup
MailPipe’s automated warmup system generates a smart schedule, sends warmup traffic through a real mailbox network, monitors your sender score across Gmail, Outlook, and Yahoo in real time, and alerts you if reputation drops before it affects your campaigns.
Ready to warm up the right way? Start your free MailPipe account and let our AI handle the entire process.