What is email warmup? A plain-English guide
Why new mailboxes struggle to reach the inbox, and how warmup builds the reputation they need.
By Pipenbox team
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Every mailbox provider has to decide, for every message, whether it belongs in the inbox. A brand-new mailbox gives them very little to go on — so they play it safe.
Why new mailboxes land in spam
Providers look at a sender's history: how much it sends, whether people open and reply, and whether recipients mark messages as spam. A mailbox with no history looks the same as a freshly created spam account.
What warmup does
Warmup builds that history on purpose. Your mailbox exchanges a small, steadily growing number of conversations with other real mailboxes. Those messages are opened, replied to, and — if they land in spam — moved back to the inbox.
How to tell when a mailbox is ready
Instead of guessing, watch the signals:
- The mailbox status moves from warming to healthy
- Inbox placement tests show most messages landing in Primary
- Your weekly inbox rate holds steady as volume grows
Next steps
Connect a mailbox, let it warm up, and run a placement test before your first campaign.