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Your Cold Emails Are Landing in Spam Right Now.
Every hour you wait is pipeline you are not booking.
Get prewarmed Google, Microsoft, and Azure inboxes live today without touching a DNS record, waiting 4 weeks for warmup, or risking your primary domain.
Even if you have burned every domain you have ever set up.
Even if you have zero technical background.
Even if you need 50 inboxes running by tomorrow morning.
This is the same infrastructure we use to send 1,000,000+ cold emails every month at 4%+ reply rates.
We are not resellers. We are operators who built this for ourselves and now let you use it.
Trusted by Agency Velocity, Revenue Boost, PLNitude, Understory, B2BScale and 500+ more teams
Start Sending Today. Your First Domain Is Free.
No warmup wait. No DNS headaches. Inboxes delivered same day.
What Is WarmInboxes?
WarmInboxes is a done-for-you cold email infrastructure service run by people who actively send cold email at scale, not by resellers who have never launched a campaign.
We deliver prewarmed and fresh Google Workspace, Microsoft 365, and Azure email inboxes, fully configured, DNS-verified, and integrated with your sequencer, so you can launch cold outreach campaigns today without waiting, without technical setup, and without touching a single DNS record.
Here is what makes us different from every other provider:
We also run our own agency on this exact infrastructure. We send over 1,000,000 cold emails a month and hold a 4%+ reply rate across campaigns. If the infrastructure does not perform for us, we do not ship it to you. That is our quality control process.
Why Your Deliverability Keeps Breaking. And Why It Is Not Your Fault.
You have done everything right. And it still breaks. Here is why.
Your reply rates quietly dropped from 4% to 0.3% and you did not notice for two weeks.
A domain got flagged and you lost 6 weeks of warmup history overnight.
Your warmup tool network got blacklisted and poisoned every inbox connected to it.
You scaled volume and deliverability collapsed, and your current provider told you to "wait and see."
You had a client campaign go live and the inboxes were hitting Promotions, not Primary.
The 4 invisible places where cold email infrastructure dies:
DNS misconfiguration
One wrong DMARC policy, p=none instead of p=reject, or a missing semicolon, and you silently fail authentication. Emails deliver but reputation decays. Most teams never find it.
Shared tenant contamination
When a provider stacks multiple clients on the same Google or Microsoft organisational environment, one bad sender bleeds into everyone else. You did not burn your domain. Someone you have never met did.
Fake warmup signals
Cheap warmup tools cycle between the same 500 accounts. Inbox providers fingerprinted those patterns years ago. They discount the engagement entirely. Your "warmed" inbox has no real reputation.
No recovery plan
When infrastructure breaks mid-campaign and it will, most providers take 24 to 72 hours to respond. Your pipeline stalls. Your client asks questions you cannot answer. You lose a week rebuilding.
The 3-Step Infrastructure Play Nobody Else Runs
Most providers give you inboxes and hope for the best. We give you a system, the same system we use to send 1M+ emails per month without losing a week of pipeline when something breaks.
Launch today with prewarmed inboxes
Free .com domains. Fully warmed. Ready to send. Zero wait time. You sign up, receive your CSV, plug into your sequencer, and send the same day you order. This is how you capture revenue right now, not in 4 weeks.
Ramp volume with fresh infrastructure
Once your campaign is booking meetings and your messaging is dialled in, you layer in fresh domains and fresh inboxes at a fraction of the cost per send. Same deliverability. 3x the sending capacity.
Keep prewarmed on standby for when infrastructure burns
When your infrastructure breaks mid-campaign, one WhatsApp message gets prewarmed inboxes deployed into your sequencer the same day. Pipeline does not stall. Meetings keep booking. Clients never know.
What You Get With Every WarmInboxes Order
Prewarmed inboxes ready to send the day you order
Google Workspace, Microsoft 365, and Azure, real business accounts, not grey-market resold accounts.
Free prewarmed .com domains
Already warmed. Already forwarding to your primary domain. Zero domain cost, zero warmup wait.
Human-verified DNS every time
SPF, DKIM, DMARC, and MX records manually checked before delivery. No automated scripts that miss errors.
Workspace-level isolation
Every domain in its own workspace. One client bad campaign cannot touch another client infrastructure.
US and EU IPs
Diversified infrastructure so one blacklist never kills your pipeline.
24/7 WhatsApp support from real operators
Not a ticket queue. Not a chatbot. The people supporting you run their own cold email campaigns every day.
Same-day delivery
Order by 3pm and your inboxes are in your hands today.
Google + Microsoft 365 + Azure, all three
The only provider in this category supporting all three major platforms.
Works with every tool in your stack
Instantly, Smartlead, EmailBison, ManyReach, Apollo, ZoomInfo, HubSpot. If it supports IMAP/SMTP or OAuth, plug in and go.
Results That Hold Under Volume
Same infrastructure. Same playbook. Available to you.
2.8M Sent · 6.05% Reply Rate · $8.5M Opportunities
2.3M Sent · 4.87% Reply Rate · $6.9M Opportunities
1.3M Sent · 4.41% Reply Rate · $3.3M Opportunities
279.5K Sent · 4.61% Reply Rate · $1M Opportunities
15.44% Reply Rate · $305K Opportunities
What Cold Email Operators Are Saying
Real operators. Real results. Real infrastructure.
"Great support and stellar setup they are our main suppliers for cold email inboxes"
AJ Cassata · Founder, Revenue Boost
Why 500+ Cold Email Teams Run on WarmInboxes
Send today, not in 4 weeks
Prewarmed inboxes with free .com domains. No warmup period. No delays. Same-day delivery on every order.
Infrastructure tested at 1M+ sends per month
We do not sell infrastructure we have not proven ourselves. Our own agency runs on this stack.
Google, Microsoft 365, and Azure
Every other provider covers one or two platforms. We cover all three, because enterprise B2B outreach requires it.
When infra burns, recovery is one WhatsApp message
Mid-campaign emergency? One message gets prewarmed deployments in your sequencer the same day. No tickets. No waiting.
Built by certified operators, not resellers
Instantly Certified Expert. Smartlead Partner. Clay Verified Partner. The people building your infrastructure actively run cold email campaigns every day.
Every DNS record human-verified
Automated DNS setup misses errors. We manually check every record before delivery. Because a single wrong character in your DMARC policy silently breaks your deliverability.
Get Your Infrastructure Live Today
Free prewarmed .com domain with every order. Same-day delivery. warm inbox placement guaranteed.
Why WarmInboxes Is Not the Same as Every Other Inbox Provider
The inbox provider market is crowded. Most providers are doing one thing: reselling Google Workspace accounts and calling it done.
We send cold email ourselves. Every day.
This is not a hosting company that decided to sell inboxes. This is an agency that sends 1M+ cold emails per month, hit a wall with every existing provider, and built the infrastructure we needed ourselves. The stack you are buying is the stack that runs our own pipeline.
Google + Microsoft 365 + Azure, all three under one roof.
Enterprise B2B prospects are overwhelmingly on Microsoft-hosted domains. When your sending infrastructure matches your prospect receiving infrastructure, deliverability improves. No other provider offers Azure tenants. We do.
Free prewarmed .com domains, no extra charge, no extra wait.
Every other provider charges $10 to $20 per domain and then makes you wait 3 to 4 weeks for warmup. We include ready-to-use, pre-aged .com domains at no additional cost. The warmup is already done.
The 3-step system, not just a product.
We do not just sell you inboxes. We give you a framework: launch with prewarmed, scale with fresh, keep prewarmed on standby. This is how professional cold email operations are built.
When something breaks, we respond in minutes, not days.
24/7 WhatsApp support from people who run cold email campaigns. When your infrastructure breaks at 11pm before a campaign launch, you are not waiting until business hours.
WarmInboxes Is Built for You If...
You are a cold email agency managing multiple clients and need infrastructure that scales without adding hours of technical setup per client.
You are a SaaS founder or outbound sales lead who wants to run cold outreach without building an in-house infra team or spending weeks on domain warmup.
You have had infrastructure fail mid-campaign and need a provider with a real recovery system, not a support ticket queue.
You are running enterprise B2B campaigns where your prospects are on Microsoft 365 or Azure, and you want matching infrastructure to maximise inbox placement.
You need inboxes live today, not next week after a warmup cycle. Today.
You want to scale without burning your foundation. The 3-step play is how you grow volume without destroying what is already working.
You value support from people who actually understand what you are doing.
WarmInboxes is probably NOT right for you if:
You only send a handful of personal emails per week and have no cold outreach volume.
You are looking for a full campaign management or sequencing tool. You bring your sequencer, we provide the infrastructure.
You need email marketing automation for newsletters or transactional email.
Here Is What the Next 8 Hours Look Like When You Order Now
Every order same day. No exceptions.
You complete your order
Takes under 5 minutes
DNS configured, human-verified, your CSV is ready
SPF, DKIM, DMARC, MX, all verified
Inboxes loaded into your sequencer
Pre-formatted for your tool
First campaign queued and ready to send
No delays, no waiting
Replies in your inbox
Pipeline moving
Everything You Get When You Order From WarmInboxes
The full value stack, visible before you see the price.
Prewarmed Official Business Inboxes
Google Workspace, Microsoft 365, or Azure, your choice. Real licensed accounts. Established warmup history built in. Not resold. Not grey-market.
Normally requires 3 to 4 weeks warmup if set up yourselfFree Prewarmed .COM Domain
A clean, aged .com domain, already warmed, already forwarding to your primary domain, fully DNS-configured.
Value: $10 to $20/year in domain cost plus 3 to 4 weeks warmup time, included freeComplete DNS Configuration (Human-Verified)
SPF, DKIM, DMARC, and MX records, every one manually verified before delivery. No automated scripts.
Value: 2 to 4 hours of technical setup per domain, includedSame-Day CSV Delivery
Full login credentials plus sequencer-ready export in the format your tool expects. No reformatting. Plug in and go.
Delivered within hours of your orderWorkspace-Level Isolation
Every domain in its own isolated workspace. One bad campaign cannot touch your other infrastructure. No shared tenants.
Standard only on premium plans elsewhere, included at every tierUS and EU IP Diversification
Your infrastructure runs across US and EU IP ranges. One blacklisted IP range does not kill your pipeline.
Included, no extra charge24/7 WhatsApp Support
Real operators. Real responses. When infrastructure breaks at midnight, someone picks up. No ticket queues. No chatbots.
No business hours restrictionThe 3-Step Scaling Playbook
The exact system we use to send 1M+ cold emails per month: prewarmed for launch, fresh for scale, prewarmed on standby for recovery.
The playbook most agencies never get access to, includedSimple Infrastructure Pricing
No setup fees. No contracts. Cancel anytime.
Choose Your Infrastructure
Launch today 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.
Microsoft Inboxes
(FREE Prewarmed .COM/.CO)
3 Ready-to-use Microsoft inboxes with a free prewarmed domain - no warmup period required.
Paid quarterly
Google Inboxes
(FREE Prewarmed .COM/.CO)
3 Ready-to-use Google inboxes with a free prewarmed domain - no warmup period required.
Paid quarterly
Azure Inboxes
(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
Calculate What You Need
Talk to 24/7 support
Contact Support on WhatsAppThis Week Only: Free Prewarmed .COM Domain With Every Order
Order this week and your first .com domain is included, already warmed, already DNS-configured, already forwarding. This offer is available to the first 50 orders this week.
Compare Every Package
Five products, side by side. Prewarmed sends today and costs more per inbox; fresh costs about a third as much and needs two to three weeks of warmup first.
| Prewarmed GooglePrewarmed | Prewarmed M365Prewarmed | Azure tenantPrewarmed | Fresh GoogleFresh | Fresh M365Fresh | |
|---|---|---|---|---|---|
| Best for | A Google-heavy list you want to start emailing today | An Outlook-heavy list you want to start emailing today | Diversifying away from one platform, and volume | A campaign that already works, scaling on your own brand | A working campaign scaling into Microsoft-hosted prospects |
| Ready to send | Same day | Same day | Same day | 14–21 days | 14–21 days |
| Domain | Free prewarmed .COM/.CO, included | Free prewarmed .COM/.CO, included | Free prewarmed domain, one per tenant | Your own branded domains, or bought through us | Your own branded domains, or bought through us |
| Smallest order | 3 inboxes on one domain | 3 inboxes on one domain | 1 tenant, up to 100 inboxes | No minimum | No minimum |
| Price | $6–$8 per inbox / month$6 quarterly, $7 every 2 months, $8 monthly | $6–$8 per inbox / month$6 quarterly, $7 every 2 months, $8 monthly | $0.50–$0.69 per inbox / month$50–$69 per tenant per month, 100 inboxes per tenant | $2.00–$3.50 per inbox / monthFalls at 30 and at 100 inboxes, and on longer billing cycles | $2.00–$3.00 per inbox / month$2 yearly, $2.50 quarterly, $3 monthly, at any order size |
| Warmup | None. Already warmed | None. Already warmed | None. Already warmed | 14–21 days, run by our technicians | 14–21 days, run by our technicians |
| Admin and DNS | SPF, DKIM and DMARC set before handover | SPF, DKIM and DMARC set before handover | Your own isolated tenant on Microsoft Entra | SPF, DKIM and DMARC set before handover | SPF, DKIM and DMARC set before handover |
Every order, on any of the five, includes warm inbox rotation, deliverability monitoring, automated reconnections, replacement inboxes if deliverability drops, and 24/7 support on WhatsApp. Full prices for every billing cycle are at /price.md.
Which should I buy?
Four questions decide it, and the first one is about your list rather than about us.
Your lead list is mostly Google-hosted
Prewarmed Google
Check it first with the free ESP Segmenter. A Google-heavy list is the case where Google-to-Google sending is worth paying the prewarmed premium for.
Your lead list is mostly Microsoft-hosted
Prewarmed Azure
Enterprise lists skew Microsoft, and an Azure tenant sends from Microsoft Entra, so the recipient platform still matches. It is also the cheapest inbox we sell, which makes it the first thing to try on a Microsoft-heavy list rather than the last.
You want volume, or not to depend on one platform
Prewarmed Azure
An isolated tenant carries up to 100 inboxes on one domain at the lowest per-inbox price we have, and a filtering change on one platform cannot take your whole fleet down.
Your campaign already converts and you are scaling it
Fresh Google or Fresh M365
Fresh costs about a third of prewarmed per inbox and runs on your own brand. The trade is 14–21 days of warmup before the first send, which is only worth waiting through once you know the campaign works.
The WarmInboxes Deliverability Guarantee
If your inboxes do not achieve warm primary inbox placement within 7 days of following our sending guidelines, we deploy new inboxes for every underperforming one. Free. Same day.
If newly deployed inboxes still do not land in the primary inbox? Our engineers get hands-on with your setup, DNS, content, and sending patterns, and keep deploying until you inbox.
We have sent over 1,000,000 emails on this infrastructure. We know it works, and we stand behind every deployment with real operators, not ticket queues.
The People Behind WarmInboxes
WarmInboxes was not built to be a product. It was built to solve our own problem.
We were running an outbound agency, hitting real campaigns, real clients, real delivery targets. And we kept running into the same wall: infrastructure that looked fine on paper but failed in the field.
Domains burned after weeks of warmup. DNS setups that passed every tool but somehow still landed in spam. Inbox providers who disappeared the moment something broke. Warmup networks that had been fingerprinted by Google and were providing zero real reputation signal.
So we went deeper. We stopped outsourcing the infrastructure problem and started solving it directly, testing every provider, mapping every failure mode, building the setup that actually held under the volume we were sending at.
WarmInboxes is that system, packaged, supported, and available to you. We are not a hosting company that decided to enter the email space. We are operators who built the infrastructure we needed and now let you run on it.
Common Questions
Everything you need before you order.
WarmInboxes is a done-for-you cold email infrastructure service run by operators who send 1M+ cold emails per month. We deliver prewarmed and fresh Google Workspace, Microsoft 365, and Azure inboxes fully configured, DNS-verified, and ready to use the same day you order.
Prewarmed inboxes have established sending history and are ready to send immediately. Fresh inboxes are fresh accounts that need a standard warmup period. Our strategy: launch fast with prewarmed, scale volume with fresh, and keep prewarmed on standby as backup.
Every order includes a free prewarmed .com domain already warmed, already forwarding to your primary domain, fully DNS-configured. You can also bring your own domains and we will configure them correctly.
Same-day delivery on every order. Order by 3pm and your inboxes are in your hands that day, DNS configured, human-verified, CSV ready to plug into your sequencer.
Works with Instantly, Smartlead, EmailBison, ManyReach, Apollo, ZoomInfo, HubSpot, any tool supporting IMAP/SMTP or OAuth. We export your credentials pre-formatted for your tool of choice.
If your inboxes do not achieve warm primary inbox placement within 7 days of following our sending guidelines, we deploy new inboxes for every underperforming one free, same day. If the newly deployed inboxes still struggle, our engineers get hands-on with your setup, DNS, content, and sending patterns, and keep working with you until you land.
Three things: (1) We run our own agency at 1M+ sends/month, this infrastructure powers our own pipeline first. (2) We offer Google + Microsoft 365 + Azure under one roof, the only provider to do all three. (3) Free prewarmed .com domains included at no extra cost, no wait time.
24/7 WhatsApp support from real operators, not a ticket queue, not a chatbot. The people supporting you run cold email campaigns themselves. When infrastructure breaks mid-campaign, one message gets new inboxes deployed the same day.
The Teams Ordering Today Will Be Sending Tomorrow.
The teams waiting will be warming up for another month.
The difference is not your copy, your lead list, or your offer. It is whether your infrastructure works or not.
Version A: You order today
Campaigns running on trusted infrastructure. Inboxes landing in Primary. Pipeline moving. Clients happy. You are scaling, not rebuilding.
Version B: You wait
Still fighting DNS errors. Still waiting on a warmup cycle. Still explaining to a client why open rates collapsed. Still waiting 48 hours for support to respond.
Final Reminder: Free Prewarmed .COM Domain, This Week Only
The teams who ordered Monday are already sending. The teams ordering today are sending tomorrow.
Still have questions?
Contact us on WhatsApp. We reply in minutes.Prewarmed & Fresh Inboxes
Google, Microsoft 365 and Azure inboxes with free prewarmed domains and DNS configured before you log in. Prewarmed inboxes send the same day you order.
Get Prewarmed & Fresh Inboxes