Do you need email warmup? (yes — here's when and how)
Any new domain or mailbox sending cold email needs 2–3 weeks of warmup before real campaigns, or it lands in spam. Established, well-reputed senders can skip it. Here's the rule.
Short answer: yes — if you're sending cold email from a new domain or mailbox, warm it up for 2–3 weeks before real campaigns, or mailbox providers read your sudden volume as spam. An established mailbox with a strong reputation and steady volume can skip it. A fresh one can't.
When you need warmup
- New domain or subdomain → always.
- New mailbox on an existing domain → yes, lighter.
- Big jump in volume → ramp, don't spike.
- Established, low-complaint mailbox at steady volume → skip.
How warmup works
Automated warmup sends and replies across a network of inboxes, building positive engagement signals — opens, replies, "not spam" marks — so providers learn your domain is trusted. Volume climbs slowly, from a few sends a day up to your target over roughly 3 weeks.
Built in, automatic
Autocloz warms every connected mailbox automatically and ramps volume safely, alongside DMARC, DKIM and SPF checks and bounce auto-pause.
> Start free — connect a mailbox and warmup starts automatically.