Google and Microsoft inboxes,
provisioned and authenticated.
Cold email inboxes on Microsoft 365 or Google, with DNS, handover and the start of warm-up done for you. 100 Microsoft inboxes on one domain for $30 a month, or Google inboxes at $3 each, up to 3 per domain. Bring your own domain or have us buy one for $12.
- Live in 24-48 hours, tested firstSPF, DKIM and DMARC verified, then test sends, before the CSV reaches you.
- One tenant per domainOn Microsoft, the sending ceiling and reputation are never shared with another customer.
- Burned domain? Swap it.Name a replacement from your dashboard. Same order, no new checkout.
- Support that sends cold emailOur own outbound runs on this setup: 1.73% bounce across 26,698 contacted, on Microsoft 365.
- 1Place order
- 2Pick provider
- 3Domains & names
- 4Pay
- 5Provisioning
- 6Ready
WHAT YOU SEE
Every mailbox, every day, in your dashboard.
Which mailboxes sent, what arrived, who refused and why, recorded daily with warm-up mail set aside. The same panel we watch our own domains on.
Today so far. Days start at midnight, US Eastern.
100 provisioned · 500 sent today · 0 silent
WHOLE DOMAIN
No mailbox is blocked from sending.
500 sent from 100 of 100 mailboxes500 delivered
0% did not arrive - normal for a warming domain.
BOUNCE RATE
1.73%
461 of 26,698 contacted, across our 11 campaigns.
REPLY RATE
2.34%
625 replies from 26,698 contacted, across our 11 campaigns.
Recorded daily
The longer you warm up, the lower the failure rate.
Days 1 to 5 carried refusals, peaking at 29%. From day 6 every message arrived. That curve is what warm-up is for, and why campaign mail waits 14 days.
MEASURED, NOT CLAIMED
From our own campaigns on the Microsoft 365 inboxes we provision
1.73%
BOUNCE RATE
461 of 26,698 contacted
2.34%
REPLY RATE
625 replies from 26,698
19%
OF REPLIES POSITIVE
119 positive replies
26,698
LEADS CONTACTED
across 11 campaigns
Our own sending across 11 campaigns, all of it on Microsoft 365 inboxes, not customer results. We have not sent a campaign on Google, so there is no Google figure here and we do not claim one. Bounce rate is what the infrastructure controls; reply rate depends on your list and copy, and it ranged from 0% to 4.1% campaign by campaign. Full numbers and method.
Powering outbound for agencies and B2B teams.
SmartleadWhat is a cold email inbox?
A cold email inbox is a secondary mailbox on a domain kept separate from your company's main one, used only for outbound prospecting. Keeping outreach off the primary domain means a spam complaint or a burned sending reputation hits the throwaway domain instead of the address your customers and invoices depend on. Each inbox is authenticated with SPF, DKIM and DMARC records so receiving servers can verify the mail is genuinely yours.
Cold email inboxes are bought in batches because volume is spread thin across many of them. Sending three emails per day from one hundred inboxes looks like ordinary correspondence; sending three hundred from one inbox looks like a spam run, and filters treat it accordingly. The complete guide to cold email inboxes covers how many you need and what providers charge, or see the deliverability guide for what keeps them landing.
Infrastructure is where outbound campaigns quietly die.
Building your own cold email setup is a distraction from your core business. It’s slow, error-prone, and expensive to maintain.
DNS you’re guessing at
One wrong DMARC syntax or a missing SPF include means your emails land straight in the spam folder without warning.
Two weeks gone before the first send
Purchasing domains, creating users, verifying records, and waiting for propagation eats your launch timeline.
One burned domain takes the batch with it
Scaling too fast on a single master domain burns your core reputation forever. Isolation is mandatory.
A tenant shared with senders you can’t see
Microsoft’s external recipient limit is per tenant, not per mailbox. Share one and your daily ceiling, and your reputation, move with strangers’ sending.
Support that’s never run a campaign
Generic IT support doesn't understand cold email limits, bounce rates, or sequential warmup strategies.
Precision deployment, automated.
We do the first four. You write the campaign.
Tell us your volume
Use our configurator to determine exactly how many inboxes and domains you need.
We provision inboxes
We register isolated domains matching your brand and create the workspaces.
We verify your DNS
We configure every DNS record and verify each one resolves before handover.
We load and warm up
We connect every inbox to your sequencer and set the warmup schedule running.
You start sending
Your turn. The infrastructure is done - launch the campaign and watch replies land.
Two providers, one setup.
Microsoft for volume on a single domain. Google for senders who want the mail to come from Google, at 3 inboxes on a domain.
Microsoft 365
What each one costs, and which to pick.
Billed monthly until you cancel. Bring your own domain either way, or add $12 per domain, charged once.
MICROSOFT
$30
100 inboxes on a domain, 300 a day
$3
per inbox, 3 on a domain, 45 a day
EITHER
$12
per domain, once, if we register it
| Microsoft | ||
|---|---|---|
| Price | $30 per domain / month | $3 per inbox / month |
| Inboxes on a domain | 100 | 3 |
| Campaign sends per inbox, per day | 3 | 15 |
| Campaign sends per domain, per day | 300 | 45 |
| Cost per email of daily capacity | $0.10 / month | $0.20 / month |
| Reaches volume by | filling one domain | adding domains |
Microsoft is the cheaper way to buy daily volume and the reason most orders here are Microsoft. Google costs twice as much per email and is what people choose when they want the mail to come from Google, usually because the list is mostly Gmail. We have not measured a placement difference between them and do not claim one.
Free DNS Records Checker
Check SPF, DKIM, DMARC and MX for one domain or a bulk list.
Technical FAQ
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