Never co-mingle critical transactional notifications (such as password resets and purchase receipts) on the same IP address or sub-domain used for promotional marketing blasts. Reputational cross-contamination threatens business operations.
1. IP Pool Segmentation Architecture
| Traffic Type | Sub-Domain | IP Pool Strategy | SLA Expectation |
|---|---|---|---|
| Critical Transactional | auth.mailcampaign.us | Dedicated Pristine IP Pool (100% Rep) | < 2s Inbox Delivery |
| Account Notifications | notify.mailcampaign.us | Dedicated Transactional IP Pool | < 5s Inbox Delivery |
| Marketing Newsletters | news.mailcampaign.us | Rotated Shared / Warm IP Pool | Bulk Phased Queue |