Lifecycle
Subscription, unsubscribe, complaints, retries, and expiry.
3 topics in this category.
One-Click List-Unsubscribe (RFC 8058)
RequiredImplement RFC 8058 one-click list unsubscribe headers with HTTP POST endpoints, mailto fallbacks, DKIM signature protection, and zero login barriers.
Automated Bounce Handling & Delivery Status Notifications (DSN)
RequiredClassify and process hard and soft delivery failures using RFC 3463 enhanced status codes, Variable Envelope Return Path (VERP), and instant suppression automation.
SMTP Retry Scheduling & Queue Expiry
RequiredConfigure outbound SMTP queue management with exponential backoff, randomized jitter, greylisting survival delays, and strict 72-to-120-hour queue retention limits.