US-based Microsoft tenants. DNS fully configured. Connected directly into your Instantly account. Launch-ready within 48 hours.
Powering outbound for cold email operators sending at scale
You buy inboxes from a reseller. You get SMTP credentials in a spreadsheet. You spend two hours configuring DNS yourself. Half the records are wrong. You fix them. You start warmup. A week later you launch and half your emails land in spam.
You reach out to support. They take 48 hours to reply. They tell you deliverability is your responsibility. You eat the cost. You find another provider. Same thing happens again.
The problem isn't your copy. It's not your sending tool. It's that your inbox provider has zero stake in whether your campaigns actually work.
We built NorthHorizonMails to fix that.
Not shared tenants. Not recycled IPs. Every domain gets its own dedicated US-based Microsoft 365 tenant running on Azure infrastructure. Bulletproof IP reputation from day one.
SPF. DKIM. DMARC. All configured before your inboxes reach you. You don't touch a single DNS record. We handle it because one wrong record kills deliverability and we don't leave that to chance.
Need stronger domain quality from day one? We help you source 10+ year aged domains with a 10+ infrastructure score, giving you a cleaner foundation for deliverability.
Tenants provisioned, DNS configured, inboxes connected within 48 hours. You order, we build, you warm up.
Domain gets burned? We replace it. No extra charge. No questions. Operators scale aggressively and we built our system to handle that reality.
Instantly, Smartlead, Salesforge, or any SMTP-compatible platform. White-glove setup is available for Instantly and Plusvibe. Contact us to add other tools.
Set real profile pictures on every mailbox. Emails with profile photos look human and build trust. Higher open rates and reply rates.
Access your mailboxes to reply directly from the inbox. Useful when earlier conversations aren't accessible in your email outreach software.
Choose Normal or Premium. Select how many domains you need and how many mailboxes/domain (25, 49, 74, or 99).
We provision individual US Microsoft tenants, configure all DNS authentication, and connect your inboxes directly into your Instantly or Plusvibe account. You do nothing.
Your inboxes warm for 7 days using recommended settings. Domains build sender reputation the right way. No shortcuts, no tricks.
You're live. Fully configured Outlook inboxes. Bulletproof Microsoft Azure infrastructure. Sending from primary, not promo, not spam.
Most operators order on Monday and are warming up by Wednesday. Campaigns are live in week 2.
Complete setup included. DNS, authentication, Instantly or Plusvibe connection. Every plan. Every domain. Choose 25, 49, 74, or 99 mailboxes/domain.
Normal License
$49
100% Normal licenses
per domain every 4 weeks
Premium License
$69
100% Premium licenses
per domain every 4 weeks
Running at scale? Every 11 domains you purchase comes with a free one. Simple volume reward for operators scaling up.
Scroll horizontally to see full table →
| Normal ($49/mo) | Premium ($69/mo) | |
|---|---|---|
| Mailbox options | 25, 49, 74, or 99 | 25, 49, 74, or 99 |
| Cost per inbox (at 99) | ~$0.49 | ~$0.70 |
| Cold sends per inbox/day | 3–5 | 8–10 |
| Warmup time | 3–5 days | 3–5 days |
| Deliverability | Good | Excellent |
| Spam filter intelligence | High | Highest (strictest) |
| Infrastructure | Microsoft Azure | Microsoft Azure (higher-tier) |
| IP Reputation | Bulletproof | Bulletproof |
| IP Pool Quality | Standard | Cleaner, less saturated by cold emailers |
| Best for | Budget volume plays | Trusted high-value sends |
Go Premium if…
Sending to mid-market or enterprise ICPs where reply quality matters? Go Premium. The infrastructure is a different, higher-quality Microsoft license that most cold emailers don't use, which means you're sending from cleaner IP pools with less spam history. Your emails land where they should.
Go Normal if…
Running broad volume campaigns where cost per lead is king? Go Normal. Same bulletproof Azure infrastructure, same DNS setup, same support.
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Premium Outlook inboxes. White-glove setup. Launch-ready within 48 hours.
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