Koltrix
Email API
Processing bounce and complaint webhooks end to end
Turn bounce and complaint events into suppressions, user-facing flags and alerts. A worked pipeline from webhook receipt to updated account state.
5 min read
DeliverabilityMicrosoft SNDS and JMRP: monitoring Outlook reputation
SNDS shows how Outlook.com rates your sending IPs; JMRP forwards complaints. How to enroll, what the colors mean and how to act on the data.
5 min read
- Email API
Feedback loops and ARF: turning complaints into suppressions
Mailbox providers report spam complaints as ARF messages. Parse them, map them back to the recipient and suppress automatically within minutes.
4 min read
Email APISuppression lists: what to suppress and for how long
Hard bounces, complaints and unsubscribes each deserve different suppression rules. Design a suppression list, scopes and expiry that protect reputation.
5 min read
DeliverabilityThe 0.3% spam rate line: how it is measured and avoided
Gmail and Yahoo both draw a line at a 0.3% spam complaint rate and recommend staying under 0.1%. How the rate is calculated and how to keep it low.
4 min read