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.
DevOps & Cloud · Dec 13, 2022 · 18 min readUsing dd Safely: Swap Files, Large Test Files, and Disk Images
Use dd safely for large files, swap files, disk images, and narrow performance tests with filesystem-aware validation, rollback, and troubleshooting.
Email Deliverability · Nov 27, 2022 · 12 min readYahoo BIMI Verified Checkmarks in 2022: A New Brand Trust Indicator
A technical history of Yahoo’s verified BIMI checkmark, including what it proved, what it did not prove and how senders should diagnose display.
Email Deliverability · Nov 27, 2022 · 12 min readYahoo Subscription Management in 2022: Easier Opt-Out and Frequency Visibility
A deliverability guide to Yahoo’s November 2022 subscription experience and the consent, one-click and suppression controls marketers need.
Email Deliverability · Nov 26, 2022 · 12 min readYahoo Receipt Views and Package Alerts in 2022: Schema Beyond the Creative
An operator guide to Yahoo’s November 2022 receipt and package experiences and the structured-data controls behind enhanced inbox presentation.
Email Deliverability · Nov 25, 2022 · 11 min readGmail Package Tracking in 2022: Transactional Details Without an Open
An operator guide to Gmail’s 2022 package tracking launch and the transactional data, fallback, privacy and measurement controls it requires.
Web Tools
A searchable, categorized directory of current DNS, email, TLS, security, performance, cloud, domain, and web administration tools.
Email Deliverability · Nov 15, 2022 · 36 min readImprove Yahoo, AOL, and Cox.net Email Deliverability
Diagnose Yahoo, AOL, and cox.net delivery by IP, DKIM identity, stream, campaign and cohort using provider evidence, queue behavior, controlled containment and recovery.
DevOps & Cloud · Nov 15, 2022 · 19 min readContent Delivery Networks: A Practical CDN Deployment Guide
Plan, configure, test, and operate a CDN with safe cache rules, deliberate cache keys, protected origins, measured cutover, troubleshooting, and rollback.
DevOps & Cloud · Nov 15, 2022 · 18 min readHow to Get IP Address Space and an ASN: IRINN, APNIC, and BGP Guide
A practical IRINN and APNIC guide to IPv4, IPv6, and ASN eligibility, KYC, justification, fees, RPKI, route objects, reverse DNS, and safe BGP deployment.