At least 21 days of warm-up, and an inbox-placement test every day at Google Workspace, Outlook and Gmail. Read each domain's placement and warm-up records before you buy, then send from Instantly or the sequencer of your choice.
$5per inbox
per month
Sold by the domain: 3 inboxes for $15 a month. Domain included, no setup fee.
Pre-warmed usually means taking someone's word for it.1 Here the evidence comes first: every domain shows two records, and so does each of its inboxes.
The placement record: where each day's test messages landed at Google Workspace, Outlook and Gmail, and whether SPF, DKIM and DMARC passed. The warm-up record: how long it has warmed, every day of warm-up, and a health score.
1.In our October 2026 review of 5 pre-warmed inbox providers, none showed per-domain warm-up stats before purchase. ↩
Daily test to US seed inboxes, last 14 days
Open any domain's records before it goes in your cart. Auto-pick takes the best by 7-day warm-up inbox rate.
| Domain | Google Workspace inbox placement, last 7 days | Outlook inbox placement, last 7 days | Gmail inbox placement, last 7 days | Warm-up | Warmed | Pick |
|---|---|---|---|---|---|---|
| 97.6% | 90.5% | 95.2% | 97.6% | 27 d | ||
| 95.2% | 89.3% | 92.9% | 96.1% | 24 d | ||
| 98.8% | 94.0% | 96.4% | 98.4% | 31 d | ||
| 94.0% | 85.7% | 90.5% | 94.3% | 22 d | ||
| 96.4% | 90.5% | 94.0% | 96.8% | 25 d | ||
| 90.5% | 83.3% | 86.9% | 92.9% | 21 d |
Nothing picked yet.
Every inbox in stock gets an inbox-placement test every day. The placement record is what those tests found, day by day, not a forecast.
A placement record shows where test messages landed. It is evidence about the inbox, not a guarantee of where your own campaigns will land: that also depends on your lists, your content and your sending.
What the placement record measures, and how to read a placement test.
Day 0
A new domain gets MX, SPF, DKIM and DMARC, a custom tracking domain for Instantly, and 3 Google Workspace inboxes with realistic US names.
Days 1 to 20
Warm-up runs on every inbox, and every day lands on the domain's warm-up record: the daily chart, the 7-day warm-up inbox rate and the health score.
Day 21
Nothing goes on sale with fewer than 21 days of warm-up. The record shows exactly how many days each domain has. Every inbox in stock is placement-tested every day, so the record you read is current.
The day you buy
You read the records, pick the domain, and take its inboxes into Instantly or the sequencer you use.
Every domain arrives with its DNS done and its inboxes named. There is nothing to paste into a DNS panel.
More on the cold email infrastructure behind every domain, and a plain guide to SPF, DKIM and DMARC for cold email.
Lookup: dig +short TXT google._domainkey.northfieldgrowth.com
"v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvq3…"
Signs every message, so a receiver can check it really came from the domain and was not altered.
Connect Instantly and each inbox moves in with one Google sign-in. Or release the domain, take each inbox's address and password, and connect them in Smartlead or Lemlist or any sequencer that connects Google Workspace inboxes.
Inbox credentials are also available as a CSV export.
Your order
Your Instantly workspace
Works with any tool that connects Google Workspace inboxes, not only Smartlead and Lemlist.
How it works for Smartlead, Lemlist or any other sequencer.
Inboxes are sold by the domain: 3 for $15 a month, billed monthly through Stripe. The domain is included, there is no setup fee, and you can cancel any time. Work out what you need below.
At the default 30 sends per inbox a day, alongside the warm-up.
900 ÷ (3 inboxes × 30 a day) = 10 domains
Each bar is one domain of 3 inboxes.
The same 30 inboxes typically run about $180 to $270 a month elsewhere, often plus a domain fee.2
Sign up now2.Typical pre-warmed Google Workspace inbox pricing we observed in October 2026: about $6 to $9 per inbox a month, often with a separate domain fee. A general observation, not a quote from any one provider. ↩
Plain guides to warm-up, authentication, placement tests and sending volume, with sources for every number that matters. Start with these, browse all guides or look a term up in the deliverability glossary.
A domain with 3 pre-warmed Google Workspace inboxes: real Gmail mailboxes, each named for a person with a realistic US first and last name. It costs $15 a month ($5 per inbox), and the domain is included.
One domain: 3 inboxes for $15 a month. Inboxes are sold by the whole domain, so you buy in steps of 3.
At least 21 days before it goes on sale. Every domain shows exactly how many days it has warmed, so you can see it before you buy.
Every inbox in stock gets an inbox-placement test every day. It sends to seed inboxes at Google Workspace, Outlook and Gmail in the US, and records where each message landed (the inbox, a category tab or spam) and whether SPF, DKIM and DMARC passed. The placement record shows those results by provider, day by day, with the inbox rate over the last 7 days, for each domain and for each of its inboxes.
Google Workspace (business accounts), Outlook (Microsoft 365, business accounts) and Gmail (personal accounts). The seed inboxes are in the US.
No. It shows where our test messages landed. Where your own campaigns land also depends on your lists, your content and how you send.
Warmed for at least 21 days, tested every day, with the records to show for it. $5 per inbox a month, $15 a domain, domain included.