Cubes & Dedicated IPs
What Are Cubes?
Cubes are Mission Inbox's proprietary workload-specific isolation technology. Each Cube is a dedicated server instance assigned to a specific email workload. Unlike traditional ESPs that give you a shared IP, Mission Inbox gives you an entire dedicated server.
How Cubes Work
Each customer's email traffic is separated into distinct Cubes based on workload type:
- Sales & Marketing Cube: Cold outreach, prospecting, campaigns, newsletters
- Transactional Cube: OTPs, user alerts, confirmations, receipts, notifications
- Financial & Legal Cube: Invoices, statements, receipts, compliance notices
- Compliance Cube: Legal notices, disclosures (for enterprise customers)
Each Cube operates independently with:
- Its own dedicated server
- Its own dedicated IP addresses
- Its own sender reputation
- Workload-specific configurations
Dedicated IPs
What You Get
- Between 2 or 3 dedicated IPs depending on volume
- 100% owned by you
- Zero shared risk with other senders
- Full PTR/rDNS control
- Warmup guidance included
Why Dedicated IPs Matter
Shared IPs mean your deliverability depends on the behavior of strangers. If another sender on the same pool gets blacklisted, your emails suffer too. Mission Inbox eliminates this risk entirely.
Cube Plans
Plan | Cubes | IPs | Best For |
|---|---|---|---|
Starter | 1 | 2 | Small teams, testing |
Growth | 2 | 4 | Growing sales/marketing |
Pro | 4 | 8 | High-volume senders |
Enterprise | Custom | Custom | Large organizations |
Cube Setup Process
- Choose your plan
- Select workload types
- Mission Inbox provisions your Cube(s) within 24 hours
- Domain authentication (SPF, DKIM, DMARC) is configured
- IP warmup guidance provided
- Start sending
Monitoring & Management
Each Cube includes:
- Real-time sending statistics
- IP reputation monitoring
- Blacklist alerts
- Bounce rate tracking
- Open/click analytics (if enabled)
Technical Specifications
- Server: Dedicated VPS
- OS: Linux (Ubuntu/Debian)
- MTA: Postfix (configured and managed by Mission Inbox)
- IP Type: IPv4 dedicated
- PTR Records: Fully configured
- Authentication: SPF, DKIM, DMARC pre-configured
- SMTP Ports: 25, 587, 465 available
- API Access: REST API for programmatic sending
Updated on: 27/02/2026
Thank you!