AJ Cassata — Founder, Revenue Boost (Instantly Certified)
"Warm Inboxes transformed our cold email deliverability."
Shares how Warm Inboxes helped transform their cold email campaigns and boost client results.
Cold Email Infrastructure — US + EU IPs
The Fastest and Safest Way To
Launch Cold Emails Today.
Official Google, Microsoft 365 and Azure inboxes. Free prewarmed .com domains. Same-day delivery.
Built by operators sending 1M+ cold emails a month.
- Google Workspace inboxes — official, fully managed
- Microsoft 365 & Azure inboxes
- Prewarmed — no warmup wait, send from day one
- Free .com domain included with every package
- SPF, DKIM, DMARC configured before you log in
- US + EU IP infrastructure
- 24/7 WhatsApp support from real operators
Built and endorsed by Instantly Certified Experts · Smartlead Certified Partners · Clay Experts
Why Cold Emailers Rely On Us
1. Launch today with prewarmed inboxes
FREE domains. Fully warmed. Ready to send. Zero wait time. You hit send the day you sign up.
2. Ramp volume with fresh infrastructure
Once your campaign is booking meetings, we layer in fresh inboxes on your own branded domains at a fraction of the cost per send. Same deliverability. 3x the output.
3. Keep prewarmed on standby for when infrastructure burns
Cold email is a contact sport. Domains get flagged. IPs get hit. When it happens mid-campaign, one WhatsApp message gets prewarmed inboxes dropped in the same day. Pipeline doesn't stall. Meetings keep booking.
What You Get
- Deliverability tested at 1M+ sends/month — Diversified across US + EU IPs. One blacklist never kills your pipeline.
- Zero setup headaches — Domains, SPF, DKIM, DMARC, and forwarding handled before you log in.
- 24/7 WhatsApp support from real operators — No tickets. No chatbots. Real humans who run cold email every day.
- Trusted by agencies that can't afford downtime — Agency Velocity, Revenue Boost, PLNitude, Understory, Mailfirst, B2BScale.
Customer Results
- 2,338,200 emails sent · 4.87% reply rate · $6,902,978 in pipeline
- 1,310,300 emails sent · 4.41% reply rate · $3,301,591 in pipeline
- 279,500 emails sent · 4.61% reply rate · $1,025,058 in pipeline
- 790 sequences · 15.44% reply rate · $305,000 in pipeline
Integrates With Your Outbound Stack
Works seamlessly with all major cold email tools. No migration. No friction. Plug in and go.
- Instantly.ai
- SmartLead.ai
- EmailBison
- ManyReach
- Apollo
- ZoomInfo
- HubSpot
- Cloudflare
- Porkbun
- GoDaddy
Pricing
All prices in USD per inbox per month. Prewarmed packages include a free prewarmed .COM/.CO domain and are billed monthly, 2-monthly, or quarterly. Fresh inboxes are billed monthly, quarterly, or yearly.
Prewarmed Inboxes (ready to send the same day)
| Product | Monthly | 2-Month | Quarterly |
|---|---|---|---|
| Prewarmed Google Inboxes (3 ready-to-use, free domain) | $8/inbox | $7/inbox | $6/inbox |
| Prewarmed Microsoft Inboxes (3 ready-to-use, free domain) | $8/inbox | $7/inbox | $6/inbox |
| Prewarmed Azure Tenant (100 inboxes per tenant) | $0.69/inbox ($69/tenant) | $0.60/inbox ($60/tenant) | $0.50/inbox ($50/tenant) |
Example: 3 prewarmed Google inboxes with a free domain cost $24/month on monthly billing or $18/month on quarterly billing. Lower-cost prewarmed inboxes on non-.COM extensions are available from $4.50/inbox via support.
Fresh Google Workspace Inboxes (your branded domains, 14-21 day warmup)
| Volume | Monthly | Quarterly | Yearly |
|---|---|---|---|
| No minimum | $3.50/inbox/mo | $3.25/inbox/mo | $3.00/inbox/mo |
| 30+ inboxes | $3.25/inbox/mo | $3.00/inbox/mo | $2.50/inbox/mo |
| 100+ inboxes | $3.00/inbox/mo | $2.50/inbox/mo | $2.00/inbox/mo |
Fresh Microsoft 365 and Azure
| Product | Monthly | Quarterly | Yearly |
|---|---|---|---|
| Microsoft 365 | $3.00/inbox/mo | $2.50/inbox/mo | $2.00/inbox/mo |
| Microsoft Azure Tenant (25-100 inboxes) | $50/domain/month | - | - |
What Our Customers Say
Leevi — Founder, Agency Velocity (Instantly Certified)
"Easiest way to launch cold email."
Shares how Warm Inboxes provides the easiest way to launch cold email campaigns.
Naufal — Head GTM Engineer, Understory (Clay Certified)
"Warm Inboxes delivers exceptional results."
Shares how Warm Inboxes helped optimize their go-to-market email strategy.
Papa — Founder, Leveraged Outbound
"Our infra was completely burned and Warm Inboxes saved us from losing clients."
When infrastructure was completely burned, Warm Inboxes deployed new prewarmed inboxes the same day and kept the pipeline alive.
Emmanuel — Founder, PLNitude (Smartlead Certified)
"Getting new clients through our cold email infrastructure."
Upscale's cold email infrastructure helped him acquire new clients consistently.
Frequently Asked Questions
What is Warm Inboxes?
Warm Inboxes is your trusted platform for purchasing prewarmed and regular email accounts for Google Workspace and Microsoft 365. We ensure your accounts are ready for successful email outreach, with a focus on high deliverability and ease of setup.
Why Choose Warm Inboxes?
We make it simple to get started with prewarmed email accounts that are optimized for deliverability. Our accounts use both US and EU IP addresses and are carefully configured for cold outreach success. Whether you need prewarmed or normal mailboxes, we've got you covered.
How Does Warm Inboxes Improve Email Deliverability?
Prewarmed email accounts help ensure your emails land in the inbox, not the spam folder. We handle the technical essentials, including proper configuration of DKIM, SPF, and DMARC records, saving you time and effort.
Which Email Providers Do You Support?
We provide email accounts on Google Workspace and Microsoft 365/Azure.
Do I Have Full Access to My Mailboxes?
Yes, you'll have complete control of your email accounts, including admin access, so you can manage them with ease.
Can I Use My Own Domains with Warm Inboxes?
Absolutely. If you already own a domain, we can help you set it up with mailboxes and ensure everything is configured correctly for optimal performance.
Do You Offer Prewarmed Email Accounts?
Yes, we specialize in prewarmed email accounts, which are designed to improve deliverability and ensure your emails are ready to reach inboxes right away.
Can I Purchase Domains Through Warm Inboxes?
Yes, you can purchase .com domains for only $12 USD. Free domains are included with every prewarmed inbox package.
How Does Your Pricing Work?
Prewarmed inboxes are $8/inbox/month on monthly billing, $7 on 2-month, and $6 on quarterly, sold in ready-to-use packs of 3 with a free prewarmed .COM/.CO domain, so a 3-inbox package is $24/month (or $18/month on quarterly). Prewarmed Azure tenants are $0.69/inbox/month with 100 inboxes per tenant. Fresh Google Workspace inboxes run $3.00 to $3.50/inbox/month and fresh Microsoft 365 inboxes $2.00 to $3.00/inbox/month depending on volume and billing cycle. No-refund policy applies.
What's Your Refund Policy?
We do not offer refunds. We encourage you to review our terms carefully or reach out with any questions before making a purchase.
Free Email Deliverability Tools
- Blacklist Checker — Check domain/IP against 20+ email blacklists
- Deliverability Checker — Test your inbox placement rate
- DMARC Checker — Validate your DMARC record and policy
- SPF Checker & Generator — Look up or build a valid SPF record
- DNS Checker — Query MX, TXT, CNAME, A and all DNS record types
- Domain Expiry Checker — Monitor domain expiration dates