NitWings Insights
Technical Insights
Practical field notes for teams diagnosing email deliverability, DNS authentication, sender reputation, Linux, MTA, cloud, monitoring, and DevOps failures.
Articles on email deliverability, DNS, Linux, MTA operations, DevOps, monitoring, and incident recovery.
Short, practical guidance for teams that need to diagnose, repair, and run production email systems.
Browse by issue, provider, workflow, or stack area when you need a fast starting point for investigation.
Email Deliverability · Feb 28, 2026 · 13 min readEmail Header Analysis: Trace Routing, Authentication and Delays
A practical forensic workflow for tracing email routing, authentication, identity and timing from a complete raw message.
Email Deliverability · Feb 23, 2026 · 12 min readEmail Delivery Rate vs Inbox Placement: What Each Metric Proves
A measurement guide that explains what SMTP acceptance proves, what placement evidence can show and how to combine delivery, provider and recipient signals.
Email Deliverability · Feb 19, 2026 · 13 min readEmail Spam Traps: Types, Diagnosis and Prevention
A source-focused guide to spam-trap risk that avoids trap hunting and repairs the acquisition, permission or inactivity process that allowed risky addresses.
Email Deliverability · Feb 17, 2026 · 13 min readMicrosoft SNDS: Monitor Outlook IP Reputation and Traffic
A practical operations guide to Microsoft Smart Network Data Services, including access authorization, baselines, incident correlation and the limits of SNDS data.
Email Deliverability · Feb 16, 2026 · 12 min readEmail Blocklists: Monitoring, Diagnosis and Delisting
An incident-response method for IP, domain and URL blocklist listings, from evidence and containment through remediation, delisting and recovery monitoring.
Email Deliverability · Jan 27, 2026 · 11 min readGmail AI Overviews and AI Inbox in 2026: Visibility Without a Traditional Open
A technical editorial guide to Gmail’s recipient-side AI surfaces, where message facts may be summarized or prioritized without a traditional open.
Email Deliverability · Oct 23, 2025 · 11 min readYahoo Sender Hub Insights in 2025: Provider Complaint and Delivery Trends
An expert measurement guide to Yahoo’s delivered-message and complaint-rate trends, including the inbox-delivered denominator and evidence limitations.
Email Deliverability · Sep 26, 2025 · 11 min readGmail Most Relevant Promotions in 2025: Engagement-Based Promotional Ranking
A deliverability and campaign guide to recipient-specific Promotions ordering where recency is no longer the only visible sequence.
Email Deliverability · Sep 24, 2025 · 11 min readGmail Purchases View in 2025: Transactional Email Outside the Standard Inbox
A transactional-email guide to Gmail’s purchase and delivery surface, where useful order facts can appear beyond the standard inbox list.