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Prewarmed Outlook inboxes

Prewarmed Outlook inboxes for cold email

If you call them Outlook inboxes, these are them. Paid Microsoft 365 mailboxes, aged 30 days and warmed 21, ready the day you get them.

Get inboxes at Warm Inboxes See pricing

prewarmed.org is operated by the team behind Warm Inboxes (warminboxes.com) and Upscale B2B (upscaleb2b.com). Orders are fulfilled by Warm Inboxes.

ProviderMicrosoft 365, Exchange Online

Also calledOutlook inboxes, M365 mailboxes

Domain age when you get it30 days minimum

Warming21 days of real emails sent and received

Email recordsSPF · DKIM · DMARC · MX already set

Suggested volume15 cold emails per inbox per day

You get itSame day, business days

Who this is for

Sellers who say Outlook, not M365

Same product, plainer name. Nothing about the mailbox differs.

Teams migrating off consumer accounts

Free Outlook.com accounts are not sending infrastructure. Licensed mailboxes on a domain you control are.

Anyone told to avoid Microsoft for cold email

That advice is usually a generalisation from a Google-weighted list. Check your own mix first.

Outlook, Outlook.com, Microsoft 365: which one you are buying

Outlook means three different things, and which one you buy decides whether your campaign works. Outlook the app is just software for reading email. Outlook.com is Microsoft's free personal email. Microsoft 365 is the paid business product, and that is the one that matters here.

For cold email you want the third one. A free personal account cannot use your own domain properly and will not hold up once you send at any real volume. If someone offers you cheap Outlook inboxes, find out which of the three they mean before you pay.

What changes when your recipients are on Outlook

Microsoft is harder on new senders than Gmail, and it pays close attention to how often people mark your mail as spam. In practice that means building up your volume more slowly, keeping bounces low, and a stronger reason to send from Microsoft if your list is on Microsoft.

Landing in Gmail but going to junk at Outlook is normal early on and does not mean your setup is broken. It means you should read what Microsoft wrote into the email, because it tells you why.

Pricing

Prewarmed Microsoft 365 · sold in packs of 3 · prewarmed domain included
Billing	Per inbox	Pack of 3
Monthly	$8	$24
2-Month	$7	$21
Quarterlybest value	$6	$18

Same day on business days. No refunds.

Order at Warm Inboxes →

Start date more than two months out? Fresh Microsoft 365 inboxes cost less and you warm them yourself.

Questions

Are these Outlook.com accounts?

No. Licensed Microsoft 365 mailboxes with Exchange Online, on a domain you control.

What is the difference from your Microsoft 365 page?

None. Same product, different vocabulary. Buyers search both.

Can I use these with any sequencer?

Yes. Prefer OAuth over basic authentication where supported.

How many can I run?

Three per domain at 15 sends a day each is the configuration we recommend and operate.