What Is Email Warmup and Why It Matters
Email warmup helps build your sender reputation, increasing the chances that your emails land in recipients' inboxes instead of their spam folders.
Lauren Gilbert
Last Update 14 days ago
How Email Warmup Works
When you create a new email account, email providers don't yet know whether it's a trustworthy sender because it has little or no sending history.Automailer gradually builds that reputation by sending and receiving emails, generating positive engagement (such as opens and replies), and helping warmup emails reach the inbox instead of the spam folder. This activity helps email providers recognize your inbox as a legitimate sender.
Why Email Warmup Is Important
Email warmup helps you:
- Improve inbox placement
- Build your sender reputation
- Reduce the risk of new inboxes being flagged as spam
- Maintain the reputation of existing inboxes
- Increase the likelihood of higher open and reply rates
How Long Should You Warm Up?
For best results:
- Warm up new inboxes for 2–4 weeks before launching cold email campaigns.
- Gradually increase your sending volume over time.
- Keep warm-up enabled even after launching campaigns to maintain your sender reputation.
Important Note
Email warmup is most effective when combined with:
• Domain authentication (SPF, DKIM, and DMARC)
• Email verification
• Responsible sending practices, such as avoiding sudden spikes in sending volume and sending relevant emails
Email warmup is most effective when combined with:
• Domain authentication (SPF, DKIM, and DMARC)
• Email verification
• Responsible sending practices, such as avoiding sudden spikes in sending volume and sending relevant emails