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Isolated Azure tenant infrastructure with Microsoft Entra based mailboxes, prewarmed on free .com domains and delivered within 48 to 72 hours. A platform few providers offer, for operators who want Microsoft reach with tenant-level control.
The same infrastructure behind 1,000,000+ cold emails every month at 4%+ reply rates.
Built by operators for their own agency first, sold to you second.
Azure infrastructure reaches the same Microsoft-hosted prospects as M365 with an extra layer of tenant-level isolation and diversification that serious volume operations use to spread risk.
Azure tenants give you your own walled-off slice of Microsoft infrastructure, built on Microsoft Entra (the identity layer formerly Azure AD). Your reputation, users, and configuration live in a tenant nobody else touches, the strongest isolation available on the Microsoft side.
Sophisticated operators never park all volume on one platform. Splitting sending across Google, M365, and Azure means one filtering change, one blacklist event, or one platform-side policy shift can never take your whole pipeline down at once.
Standing up an Azure tenant with Entra users, Exchange-capable mailboxes, correct DNS, and sane sending configuration is a systems-engineering project, not an afternoon task. We productized it: you order, we deliver a warmed, verified tenant within 48 to 72 hours.
Tenant-based infrastructure provisions in blocks, which makes both scaling and recovery fast. When a domain burns mid-campaign, the isolated tenant means the damage never spreads, and more tenants can be ordered behind it.
An Azure tenant built in-house costs engineering days before the first email sends, plus domains and warmup weeks. Ours ships warmed with free prewarmed .com domains included, and fresh capacity on branded domains costs a fraction per send when you scale.
Tenant provisioning, Entra configuration, mailbox setup, DNS, then 14 to 21 days of warmup: the honest DIY timeline is a month. Prewarmed Azure infrastructure lands within 48 to 72 hours and sends the day it arrives.
Azure cold email infrastructure is niche enough that most providers do not touch it. Our operators run it daily inside a 1M+ sends-per-month agency, and support is 24/7 WhatsApp with the people who built your tenant, not a ticket queue.
55 free deliverability tools, a free B2B leads database of 999 lists, expert playbooks, and 101 guides, including Microsoft-specific tooling like our Outlook SCL Analyzer. The full stack our own agency runs on, included.
Most providers hand you inboxes and hope. We give you the operating system we run our own 1M+ sends a month on.
Free .com domains, already warmed. Delivered within 48 to 72 hours and sending the day they land. Plug the CSV into your sequencer and go.
Once the campaign is booking meetings, layer in fresh inboxes at a fraction of the cost per send and let them warm behind live sending.
Domains get flagged, that is the sport. One WhatsApp message gets the cause diagnosed with you, and more prewarmed inboxes ordered if you need them.
We made every internal tool our agency's GTM engineers use public and free. Customers get infrastructure plus the whole operating kit.
Checkers for SPF, DKIM, DMARC, MTA-STS, blacklists, spam copy, CSV cleaning, inbox planning, and more. No account needed.
Browse the toolsDownloadable lead lists by industry and geography, hundreds of thousands of companies, emailed to you free.
Get free leadsExpert deliverability playbooks, 101 guides, and 24/7 WhatsApp support from people who send cold email daily.
Read the playbooksNew to this?
Here is what ordering actually involves.
Launch with prewarmed inboxes on free domains, then scale sending volume with fresh inboxes on your own branded domains.
Skip 21 Day warmup wait. Ready-to-use inboxes with a free prewarmed .COM/.CO domain.
(FREE Prewarmed .COM/.CO)
3 Ready-to-use Microsoft inboxes with a free prewarmed domain - no warmup period required.
Paid quarterly
(FREE Prewarmed .COM/.CO)
3 Ready-to-use Google inboxes with a free prewarmed domain - no warmup period required.
Paid quarterly
(FREE Prewarmed .COM/.CO)
100 inboxes per tenant, free prewarmed domain, no warmup needed. $50 per tenant per month.
Paid quarterly
On a budget? Prewarmed inboxes on lower-cost domain extensions from $4.5/inbox. Message us
Everything you need before you order.
An Azure tenant is your own isolated instance of Microsoft cloud infrastructure, with identity managed through Microsoft Entra and mailboxes capable of Exchange-grade sending. For cold email it means Microsoft-native inboxes that reach Outlook-hosted prospects, inside a walled-off environment that no other customer shares. We deliver the tenant prewarmed, DNS-verified, with free .com domains attached.
Both reach the same Microsoft-hosted prospects. M365 inboxes are standard Exchange Online business mailboxes; Azure infrastructure adds tenant-level isolation and block provisioning that suits larger fleets, diversification strategies, and teams that want maximum separation between their infrastructure and anyone else’s. Many customers run both, plus Google, and route by recipient.
Because it is genuinely hard: tenant provisioning, Entra identity setup, mailbox licensing, sending configuration, and DNS all have to be engineered correctly, at scale, per customer. Reselling Workspace seats is easy; productizing Azure is not. It is the reason so few providers cover Google, Microsoft 365, and Azure under one roof, and why we do.
Yes. Like our other platforms, Azure inboxes ship as a CSV pre-formatted for Instantly, Smartlead, EmailBison, ManyReach, Apollo, and any tool supporting IMAP/SMTP or OAuth.
Three profiles: enterprise-focused senders whose prospects live on Microsoft and who want the strongest isolation available, high-volume operations diversifying across all three platforms so no single event can stall their pipeline, and agencies that want per-client tenant separation as a selling point. If you are running a small single-platform campaign, start with Google or M365 and add Azure as you scale.
Everything is officially licensed Microsoft infrastructure provisioned properly, never cracked or grey-market. You get real tenants with real business mailboxes, full ownership, human-verified authentication records, and the same rapid-deployment support as every WarmInboxes platform. Your sending practices stay yours: we recommend about 15 cold sends per inbox per day and verified lists, the pace that keeps any platform healthy.
Free prewarmed .com domain with every order. Delivered in 48 to 72 hours, human-verified DNS, built for warm deliverability.
Also available: Google Workspace inboxes · Microsoft 365 inboxes
Google, Microsoft 365 and Azure inboxes with free prewarmed domains and DNS configured before you log in. Prewarmed inboxes send the day they land; every order is delivered within 48 to 72 hours.
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