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 · Jul 25, 2023 · 11 min readMicrosoft Strengthened DMARC Policy Handling in 2023
An Exchange Online operator guide to Microsoft’s 2023 DMARC policy-handling change, including rejection evidence and intermediary diagnosis.
Email Deliverability · Jun 21, 2023 · 11 min readApple Link Tracking Protection in 2023: Attribution Parameters at Risk
A precise guide to Apple’s 2023 Link Tracking Protection announcement, including affected contexts, parameter risk and resilient attribution design.
Email Deliverability · May 25, 2023 · 11 min readGmail BIMI Verified Checkmarks in 2023: VMC-Based Brand Verification
A practical history of Gmail’s verified BIMI checkmark and the difference between authenticated logo presentation, VMC validation and placement.
Email Deliverability · May 24, 2023 · 11 min readGoogle Inactive Account Deletion Policy in 2023: List-Hygiene Consequences
A deliverability guide to Google’s two-year inactive personal-account policy and its implications for consent, engagement, bounces and list decay.
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.
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.