Cold Email Infrastructure, SimplifiedProduction-Ready Mailboxes. Instant Deliverability. Zero Setup.
Buy domains, provision Google Workspace mailboxes, and auto-configure SPF, DKIM & DMARC — all from one dashboard. Pre-warmed, ready to send, and exportable to Instantly, Smartlead, and 5 outreach platforms.
Setup in 5 minutesCancel anytime
Trusted by 2,000+ agencies and sales teams to power cold email infrastructure
Instantly
Smartlead
Apollo
Lemlist
HubSpot
SalesforceThe RealityCold Email Infrastructure Is Broken
Most teams spend more time managing mailboxes than actually sending emails. DNS configs, warmup periods, blacklist monitoring — it adds up to hours of work that doesn't move the needle.
The Manual Way
per domain to configure DNS manually
SPF, DKIM, DMARC, MX records — each one requires copying values, navigating registrar dashboards, and hoping you didn't miss a semicolon.
per domain for agency setup fees
Outsourcing to freelancers or agencies adds up fast. At 50 domains, you're looking at $2,500-5,000 just in setup costs.
of emails land in spam without warmup
Fresh domains and mailboxes have zero reputation. Send cold without warming up and you're burning your domain from day one.
waiting for DNS propagation
After all that manual work, you still have to wait up to 3 days before you can even verify if the records are correct.
mailboxes scattered across spreadsheets
Passwords in one sheet, domains in another, login credentials in your notes app. No single source of truth.
visibility into blacklisted domains
You find out your domain is burned when replies stop coming. By then, you've wasted weeks of outreach.
With InboxOne
per domain, fully automated
Connect your registrar once. We handle SPF, DKIM, DMARC, and MX records automatically — no DNS dashboards required.
for 10 domains + mailboxes
No per-domain fees, no hidden costs. One flat price that scales with your business, not against it.
inbox rates with pre-warmed mailboxes
Skip the 2-4 week warmup period. Get mailboxes with established sender reputation, ready for cold outreach from day one.
DNS verified and propagated
Cloudflare integration means near-instant propagation. No more waiting days to find out if you made a typo.
for all your mailboxes
Every domain, every mailbox, every credential — organized in one place. Filter, search, and export in seconds.
domain health monitoring
Blacklist checks, DNS status, and deliverability scores updated continuously. Know about issues before they hurt your campaigns.
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Mailboxes Provisioned
0%
Inbox Placement Rate
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Happy Customers
0 min
Average Setup Time
PerformanceDeliverability Performance
Real metrics from millions of emails sent through InboxOne-managed mailboxes. Our infrastructure consistently outperforms industry standards.
0%
Average Inbox Placement Rate
Emails landing in primary inbox
0+
Mailboxes Managed
Across all customer accounts
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Teams Using InboxOne
Sales & marketing teams worldwide
0.0%
Uptime SLA
Enterprise-grade reliability
Where Emails Land
Distribution across email folders
Industry Comparison
Inbox placement rates compared
+19% improvement over industry average
Performance metrics based on aggregate data from InboxOne-managed mailboxes. Individual results may vary based on email content and sending practices.
AI-Powered ToolsSupercharge Your Setup with AI
Smart tools that eliminate the tedious parts of cold email infrastructure setup.
Domain Finder
Find Perfect Domains Instantly
Drop a keyword and instantly search for available, brand-ready domain names that are SEO-optimized and ready for cold email.
Instant availability checkMultiple TLD optionsBrand-ready namesBulk search
Product TourSee How It Works
Take a tour of our platform and see why teams choose Inbox One for their cold email infrastructure.
Unified Dashboard
Manage all your domains, mailboxes, and DNS settings from a single, intuitive interface. Real-time status updates and one-click actions.
Real-time mailbox statusBulk domain managementOne-click DNS configurationTeam collaboration toolsWho It's ForBuilt for Every Stage of Outbound Growth
Whether you're sending your first cold email or managing infrastructure for 50 clients — there's a plan that fits.
Solo Founders
Launching your first cold email campaigns? Start with 10 production-ready mailboxes, auto-configured DNS, and one-click exports to your outreach platform.
Growth Teams
Scaling outbound across multiple campaigns? Get 30 mailboxes, API access, and priority support built for velocity.
How It WorksMailboxes Active in Minutes, Not Weeks
No manual DNS configuration. No waiting for propagation. Three steps from sign-up to sending your first cold email.
Buy Domains & Provision Mailboxes
Purchase domains directly in Inbox One or connect your own. We auto-provision Google Workspace mailboxes and configure SPF, DKIM, and DMARC — in minutes, not days.
Warm Up & Monitor Deliverability
Use pre-warmed mailboxes with established sender reputation, or warm your own. Track inbox placement rates, monitor domain health, and auto-fix DNS issues with Inbox One Protect.
Export & Start Sending
One-click export your mailboxes to Instantly, Smartlead, ReachInbox, Reply.io, and Coldbox. Your infrastructure is ready — just plug in and scale your outbound.
Time & Cost Savings CalculatorCalculate Your ROI with Inbox One
See how much time and money you can save based on your mailbox needs.
Select your scale:
Hours Saved
on setup time
Agency Fees Saved
in setup costs
Performance Metrics
Average setup time saved
2 hoursper mailbox
DNS error rate reduced by
94%Inbox placement rate
95.2%vs 76% industry avg
Time to first campaign
10 minvs 3 days manual
Why Agencies Choose UsWhy Agencies Switch to Inbox One
Other platforms make you wait days and configure everything manually. Inbox One automates the entire stack — so you can focus on outreach, not infrastructure.
Mailboxes Active in Minutes
No more waiting 24-48 hours for provisioning. Inbox One sets up Google Workspace mailboxes with full DNS configuration in minutes — not days.
Automated DNS & Deliverability
SPF, DKIM, DMARC, and MX records configured automatically for every domain. No technical guesswork, no manual DNS edits — just inbox-ready mailboxes.
Pre-Warmed & Ready to Send
Skip the warm-up wait. Get mailboxes with established sender reputation so you can start cold outreach from day one with strong inbox placement.
AES-256 Encrypted Credentials
All passwords, TOTP secrets, and OAuth tokens are encrypted with AES-256. Your mailbox credentials stay private, secure, and under your control.
One-Click Export to 5 Platforms
Send your mailboxes to Instantly, Smartlead, ReachInbox, Reply.io, and Coldbox with a single click. OAuth-based — no SMTP credentials to copy-paste.
Priority Support That Ships
Real humans who understand cold email infrastructure. Priority support on Scale and Max plans with average response times under 2 hours.
FeaturesEverything You Need to Scale Cold Email
Domains, mailboxes, DNS, deliverability, and platform exports — all managed from one dashboard. Here's what powers your outbound infrastructure.
Automated Google Workspace Provisioning
Provision Google Workspace mailboxes with one click. We handle admin setup, 2FA, app passwords, and OAuth — your mailboxes are ready to send, not just created.
Full DNS Auto-Configuration
SPF, DKIM, DMARC, and MX records set up automatically for every domain. No manual edits, no propagation guesswork — just verified, deliverability-optimized DNS from the start.
Scale From 10 to 100+ Mailboxes
Start with 10 mailboxes on Starter, scale to 100+ on Max. Buy additional quota anytime. Multi-workspace organization keeps your clients and campaigns separated.
Inbox Placement Testing
Test where your emails actually land — inbox or spam. Run placement tests with seed accounts across Google and Microsoft, and track deliverability health over time.
Domain Health & Inbox One Protect
Monitor domain reputation, detect DNS issues, and auto-fix problems before they hurt deliverability. Inbox One Protect watches your domains 24/7 for just $2/domain/month.
Technical InfrastructureWhat InboxOne Configures For You
Every domain and mailbox comes with enterprise-grade configuration. No manual setup, no technical knowledge required.
DNS Configuration
Auto-configured for maximum deliverability
- SPF records with Google Workspace inclusion
- 2048-bit DKIM keys for email authentication
- DMARC progressive enforcement (none → quarantine → reject)
- MX records with Google priority routing
Google Workspace Setup
Enterprise-grade email infrastructure
- Admin console auto-configuration
- 2FA enforcement on all accounts
- App password generation for SMTP
- OAuth 2.0 for secure API access
- IMAP/SMTP settings pre-configured
- Workspace security policies applied
Warmup Infrastructure
Build reputation before you send
- Gradual volume ramp: 5 → 50 over 14 days
- Automatic reply and open tracking
- Engagement pattern optimization
- Cross-provider warmup (Gmail, Outlook, Yahoo)
Export & Integration
Ready-to-use in your outreach stack
- CSV export with all credentials
- Direct API push to platforms
- OAuth connection for Instantly, Smartlead
- Bulk export for 100+ mailboxes
- SMTP/IMAP credential packaging
v=spf1 include:_spf.google.com ~allgoogle._domainkey.yourdomain.comv=DMARC1; p=reject; rua=mailto:dmarc@yourdomain.comASPMX.L.GOOGLE.COM (Priority 1)For developers: Full API access available. Programmatically provision domains, create mailboxes, and manage warmup via REST API or MCP integration.
View API DocsOne-Click IntegrationsExport to 5 Outreach Platforms
One-click OAuth-powered exports. No SMTP credentials to copy-paste. Your mailboxes are ready to send the moment they hit your outreach tool.
Plus API & MCP access for custom integrations
Built for ScaleCold Email Infrastructure Done Right
Whether you're running outbound for one client or fifty, Inbox One gives you the infrastructure layer that sits beneath your entire cold email stack.
Buy domains, provision Google Workspace mailboxes, and auto-configure DNS records — all from one dashboard. No registrar hopping, no manual setup.
Pre-warmed mailboxes with established sender reputation. Or warm your own with custom schedules. Either way, your deliverability is protected from day one.
Export to Instantly, Smartlead, Reply, Lemlist, Woodpecker, and 10+ more platforms with one click. OAuth-powered — no SMTP credentials to copy-paste.
Proven ResultsTrusted by cold email agencies and growth teams worldwide
Average inbox placement rate
Mailboxes provisioned
Faster mailbox provisioning
CompareSee How InboxOne Stacks Up
See what you get with InboxOne versus setting up cold email infrastructure manually. No spin, just the facts.
InboxOne
DIY / Manual Setup
Trusted by 2,000+ agencies and sales teams worldwide
Time & Cost SavingsStop Wasting Hours on Manual Setup
Agencies spend 40+ hours per month on mailbox provisioning, DNS, and platform exports. Inbox One cuts that to under 1 hour.
Under 1 hourAutomaticOne-click OAuth24/7 automatedWhat Our Users SayTrusted by Cold Email Teams Who Scale Fast
Agencies and growth teams share why they switched their cold email infrastructure to Inbox One.
*Representative results. Individual outcomes may vary.
“We manage 200+ mailboxes for clients. Before InboxOne, setup took our team hours per domain. Now it's minutes. We've saved hundreds of hours this year alone.”
200+
Mailboxes
500+ hrs
Saved
90%+
Inbox Rate
Rachel Kim
Founder
B2B Lead Generation Agency
“Our inbox placement improved significantly after switching to InboxOne. More emails reaching prospects means a healthier pipeline. It's been a game changer.”
~25%
Better Inbox Rate
2-3x
Reply Rate
More
Reach
James Thornton
VP Sales
Enterprise SaaS Company
“I was spending thousands per year on an agency to manage our email infrastructure. InboxOne costs a fraction and does it better. The ROI speaks for itself.”
~90%
Cost Savings
10x+
ROI
100%
Self-Serve
David Okonkwo
CEO
Growth-Stage Startup
Real ResultsFrom Setup Headaches to Scalable Outbound
See how teams eliminated manual infrastructure work and scaled their cold email operations with Inbox One.
*Representative results based on typical customer experiences. Individual outcomes may vary.
Outbound Partners
Spending hours per client onboarding configuring Google Workspace, DNS records, and exporting mailboxes to cold email tools.
Switched to Inbox One for automated provisioning and one-click exports.
Velocity Sales Co.
DNS misconfiguration was causing many cold emails to land in spam. Manual SPF/DKIM setup led to frequent errors.
Inbox One auto-configured all DNS records and enabled domain health monitoring.
Trust & SecurityEnterprise-Grade Security, Built In
Your client credentials and email infrastructure are too important to leave unprotected. Here's how we keep everything secure.
AES-256 Encryption
All mailbox passwords, TOTP secrets, and OAuth tokens are encrypted with AES-256. Your credentials never leave our encrypted vault.
99.9% Uptime SLA
Your cold email infrastructure runs on enterprise-grade cloud with 99.9% uptime. We monitor 24/7 so your mailboxes are always ready to send.
Auto Domain Monitoring
Inbox One Protect watches your domains around the clock. DNS issues, reputation drops, and blacklist flags are detected and auto-fixed before they hurt deliverability.
No Credential Sharing
OAuth-powered platform exports mean your SMTP credentials are never exposed. Connect to 5 outreach tools without copy-pasting a single password.
SOC 2 CompliantGDPR ReadyCancel AnytimeNo Long-Term ContractsFAQGot Questions? We've Got Answers.
Everything you need to know before getting started with Inbox One.
Still have questions? Talk to our team
We offer a guided onboarding where our team walks you through the platform and sets up your first mailboxes with you. Start with the Starter plan at $39/month — no long-term contracts, cancel anytime.
All passwords, TOTP secrets, and OAuth tokens are encrypted with AES-256 encryption. Your credentials never leave our encrypted vault. Platform exports use OAuth — no SMTP credentials are ever exposed or copy-pasted.
Yes. You can connect existing domains and Google Workspace accounts to Inbox One. We'll auto-configure DNS records and add them to your dashboard for centralized management and monitoring.
Inbox One Protect monitors your domains 24/7. If DNS issues, reputation drops, or blacklist flags are detected, we auto-fix them before they impact your campaigns. You'll also get alerts and actionable insights in your dashboard.
Absolutely. There are no long-term contracts or cancellation fees. You can cancel your subscription at any time from your account settings. Your mailboxes and data remain accessible until the end of your billing period.
We support one-click OAuth exports to 5 platforms: Instantly, Smartlead, ReachInbox, Reply.io, and Coldbox. Plus API and MCP access for custom integrations.
Most users have production-ready mailboxes within minutes of signing up. We auto-provision Google Workspace, configure SPF, DKIM, DMARC, and MX records automatically — no manual DNS work required.
Recent BlogRecent Blog Updates
SPF, DKIM & DMARC: The Complete Guide for Cold Email
Everything you need to know about DNS authentication to maximize inbox placement and avoid spam folders.
How to Scale Cold Email: From 100 to 10,000 Emails/Day
The infrastructure playbook for agencies managing 50+ client mailboxes.
Email Warmup Best Practices: Pre-Warmed vs Fresh Mailboxes
When to buy pre-warmed mailboxes and when to warm your own — a data-driven comparison.
Cold email infrastructure platform. Buy domains, provision Google Workspace mailboxes, auto-configure DNS, and export to 5 outreach platforms — all from one dashboard.
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