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 · Oct 24, 2023 · 11 min readGmail Announced Bulk Sender Requirements in 2023: The Compliance Baseline
The October 2023 announcement explained what senders approaching 5,000 daily messages to personal Gmail accounts needed to implement before 2024 enforcement.
Email Deliverability · Oct 21, 2023 · 11 min readYahoo Announced Bulk Sender Requirements in 2023: All Hosted Domains Matter
The October 2023 Yahoo announcement set the preparation path for 2024 without publishing a numeric definition of a bulk sender.
Linux, MTA & Security · Sep 24, 2023 · 20 min readRedis Installation and Tuning
Install Redis on Linux, complete a safe first-run lab, then configure security, memory, persistence, tuning, monitoring, and production recovery.
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.
Linux, MTA & Security · May 6, 2023 · 20 min readRun Multiple MySQL Versions on One Server Safely
Run MySQL 8.4 and 9.7 safely on one Linux server with isolated containers or separate native binaries, configs, ports, sockets, data, systemd services, backups, and rollback.
Professional Development · Dec 14, 2022 · 21 min readManagement Career Levels M1–M5: Scope, Leadership, and Promotion Guide
A practical M1–M5 management framework for role design, decision rights, leadership scope, calibration, promotion evidence, career planning, and organizational growth.