Dedicated domains
Cold sending uses separate domains or isolated subdomains. The brand domain is not the experimental range.
Module 3
Deliverability Engine
Dedicated sending infrastructure, isolated from your primary domain, with authentication, warm-up gates, pacing, suppression and reply routing.
Infrastructure layers
SPF, DKIM, DMARC
DNS records are scoped deliberately, with alignment and failure handling reviewed before launch.
Staged ramp
Mailboxes start with low, consistent volume. Expansion requires stable bounce, complaint and engagement signals.
Launch gates
DNS, mailbox health, audience availability, suppression, content policy and pacing must pass before live sends.
Capacity planning calculator
This is a planning calculator, not a deliverability or reply forecast.
Day 22Earliest controlled launch day after warm-up
120First-touch emails / sending day at full capacity
3,600First-touch emails / month at full capacity
Assumes stable mailbox health and launch gates passing. It does not predict inbox placement, replies, meetings or revenue.
What we do not promise
Main Direct does not guarantee inbox placement, replies, meetings, revenue, provider approval or permanent sender reputation. The engine is designed to make failure visible and prevent avoidable reputation damage.
Need the infrastructure, not another list?
Send the segment, target geographies, current data and sending setup. I’ll show whether the constraint is data quality, validation, deliverability or message architecture.
Request infrastructure review