Cold Email Infrastructure
That Just Works
Premium Microsoft 365 inboxes with done-for-you DNS setup. No minimums. No headaches. Start sending in hours.
Powering 0+ inboxes for agencies worldwide
Why SimpleInboxes?
Everything you need to run cold email at scale — without the headaches.
Land in the Inbox, Not in Spam
Isolated Microsoft 365 tenants with US-based Azure IPs mean your emails reach real inboxes — not spam folders. Your sending reputation stays clean, always.
Pay Less, Get More — No Minimums
Competitors charge $3.90+/inbox and force you to buy 10 at a time. We start at $2.99 for Microsoft and $3.30 for Google with no minimum order. Hit 100 inboxes and it drops to $2.75/$3.00.
Real Humans, Real Fast — on Slack
No ticket queues. No chatbots. Every customer gets a dedicated Slack channel with direct access to our team — whether you have 3 inboxes or 300.
Scale to 1,000 Inboxes Without the Chaos
Isolated client workspaces, bulk operations, and a unified dashboard. Manage every client from one account — whether you have 5 or 500.
Join 500+ agencies already scaling with SimpleInboxes
The Best Deliverability Starts in the US
After analyzing deliverability across millions of cold emails, the data is clear — US-routed IPs consistently outperform APAC, EU, and shared offshore infrastructure. That's why every email you send through SimpleInboxes routes exclusively through isolated, US-based Microsoft 365 and Google Workspace tenants. No offshore routing. No shared servers. Just the cleanest IPs available.
- US-only IP routing — no APAC, EU, or offshore infrastructure
- Isolated tenants protect your sender reputation from other users
- 98.7% average inbox placement across millions of emails sent
The Best Deliverability Starts in the US
After analyzing deliverability across millions of cold emails, the data is clear — US-routed IPs consistently outperform APAC, EU, and shared offshore infrastructure. That's why every email you send through SimpleInboxes routes exclusively through isolated, US-based Microsoft 365 and Google Workspace tenants. No offshore routing. No shared servers. Just the cleanest IPs available.
- US-only IP routing — no APAC, EU, or offshore infrastructure
- Isolated tenants protect your sender reputation from other users
- 98.7% average inbox placement across millions of emails sent
Start Cheaper. Scale Even Cheaper.
Competitors charge $3.90 per inbox and won't let you start without buying 10. We charge less from inbox one — $2.99 for Microsoft, $3.30 for Google — with zero minimums. Hit 100 inboxes and the volume rate kicks in automatically.
- No minimum order — buy 1 inbox or 1,000
- $2.99/inbox (Microsoft) · $3.30/inbox (Google) — industry's lowest
- Volume rate drops to $2.75/$3.00 at 100+ inboxes
Real Humans, Real Fast — on Slack
No ticket queues. No chatbots. Every customer gets a dedicated Slack channel with direct access to our team — whether you have 1 inbox or 1,000. Every issue is handled by a real human with response times under an hour.
- Dedicated Slack channel for every customer, at every plan
- Real humans on every message — no bots, no canned responses
- Response times under an hour, resolutions same day
Ditch the Spreadsheets. Order in Minutes.
No more copy-pasting into Google Sheets or chasing email threads. Pick your provider, enter a domain, name your inboxes, connect your sending tool, and check out — all from one clean interface. Most orders take under five minutes.
- Microsoft or Google — choose your provider in one click
- Name inboxes, connect your sending tool, and check out in minutes
- No spreadsheets, no back-and-forth — just a simple web app
Your Entire Workflow, One API Call Away
Stop clicking through dashboards. Rename inboxes, rotate domains, pull health metrics — every action in SimpleInboxes is a single API call. Build it into your onboarding scripts, your CRM, or your internal tools. Ship in minutes, not days.
- Complete REST API — every dashboard action available programmatically
- Rename inboxes, swap domains, and manage DNS in bulk via code
- Webhook alerts for inbox health, order status, and DNS changes
One Dashboard. Every Client. Zero Chaos.
Stop juggling logins and spreadsheets. Agency Mode gives each client their own isolated workspace with separate billing, domains, and controls — all managed from a single dashboard. See spend across every client at a glance, bulk-rename inboxes when reps change, and cancel entire workspaces in one click when clients churn.
- Isolated workspaces — per-client domains, billing, and credit cards
- Bulk rename, bulk cancel, and bulk DNS across hundreds of inboxes
- Real-time spend breakdown across every client from one view
See How We Stack Up
The only provider with US-based IPs, no minimums, Slack support, and the lowest prices — all in one.
Set up in 1 minute. No minimums, cancel anytime.
Works With Your Sending Tools
Upload your inboxes to any major cold email platform in seconds.
Set up in under 5 minutes. Works with all major sending platforms.
Simple, Transparent Pricing
Two simple tiers. No hidden fees. No contracts.
Hit 100 inboxes and the volume rate applies to every inbox on your account — including ones you already have.
Standard
1–99 inboxes
Pricing drops automatically when you hit 100 inboxes. No action needed — the volume rate kicks in instantly.
All plans include: Done-for-you DNS · Slack support · Full API · Self-service dashboard
No credit card required. Cancel anytime.
Frequently Asked Questions
Get in Touch
Questions? We're here to help.
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