Koltrix
Deliverability
Google Postmaster Tools: the dashboards that matter
Postmaster Tools is the only first-party view into how Gmail sees your domain. Set it up, read the spam rate and compliance views, and know its blind spots.
4 min read
Email APIObservability for email pipelines: logs, metrics, traces
Trace a message from API call to SMTP response. What to log, which metrics to emit and how to correlate IDs so 'did it send?' takes seconds.
4 min read
- Deliverability
Microsoft 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
- Deliverability
Five deliverability metrics worth alerting on
Skip vanity numbers. Alert on deferral rate, hard bounce rate, complaint rate, authentication failures and delivery latency, with sensible thresholds.
5 min read
DeliverabilityInbox placement testing: seed lists, panels and limits
Seed tests show where a message lands for test accounts, not for your users. What seed lists and panel data can tell you and how to use them honestly.
4 min read