What we mean by “inbox”
When you create an “inbox” in ColdSend you’re really creating a sender address (john@yourdomain.com).
It can send mail, receive replies, and show up inside your ColdSend dashboard — but it is not a traditional mailbox (no SMTP/IMAP passwords, no log-in screen).
So… is it pre-warmed?
No, because sender addresses don’t need warming. Gmail, Outlook, etc. score three things:
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Your domain (do SPF, DKIM, DMARC pass?)
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Your sending IP (does it have a good reputation?)
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Recipient behaviour (opens, clicks, spam reports)
The local part (john@, sales@, mary@) is never evaluated separately. Creating fifty addresses adds zero reputation benefit until real people start engaging.
Why we still say “50 mails max per inbox on day 1”
Even though the address itself isn’t scored, the combination of domain + IP + From: header starts with zero engagement history. Mailing a small, high-quality slice first (≈50 recipients) gives Microsoft & Gmail the positive reactions they need to raise the hidden daily quota attached to that header. After 3–5 days of good metrics you can safely increase volume — our ramp slider automates exactly that.
What is already warmed
Every domain you add gets its own dedicated IP from our pre-warmed Azure enterprise pool. That IP has existing, positive history, so you can begin mailing immediately.
How to warm your domain (not the address)
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Week 1: mail your most engaged 50–100 leads
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Keep complaint rate under 0.2 %
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Gradually increase daily volume while engagement stays high
ColdSend’s built-in “ramp” slider can automate the daily increase for you.
Bottom line
You can start sending the same day you create a sender address—just start small, watch the metrics, and scale as real engagement proves your domain deserves inbox placement.