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 · Apr 7, 2021 · 15 min readEmail Standards Based on RFCs: A Practical Reference
A practical map of the RFCs behind SMTP, message format, MIME, IMAP, POP3, JMAP, authentication, transport security, reports, mailing lists, Sieve, and internationalized email.
Email Deliverability · Oct 28, 2020 · 13 min readYahoo AMP for Email in 2020: Interactive Campaign Requirements and Risks
An operator-focused guide to Yahoo’s 2020 AMP for Email launch, including approval, secure dynamic actions, fallback, evidence and deliverability risk.
Email Deliverability · Apr 24, 2020 · 11 min readYahoo View Time Optimization in 2020: Delivery Timing Moved Closer to Inbox Access
An expert guide to Yahoo’s April 2020 View Time Optimization, including provider-timed delivery, campaign safety, privacy and honest performance analysis.
Email Deliverability · Feb 21, 2020 · 11 min readYahoo Deliverability and Performance Feeds in 2020: Provider-Derived Analytics
An expert guide to Yahoo’s February 2020 provider-derived email feeds, including placement, engagement, identity, privacy and operational interpretation.
Email Deliverability · Nov 23, 2019 · 11 min readGmail Dynamic Email Reached Mobile in 2019: Android and iOS Impact
An expert guide to Gmail dynamic email’s November 2019 mobile rollout, including phased iOS completion, mobile interaction engineering and fallback controls.
Email Deliverability · Jul 28, 2019 · 11 min readGmail Dynamic Email on the Web in 2019: AMP Actions Inside the Inbox
An expert guide to Gmail’s July 2019 dynamic-email web launch and the engineering, security, deliverability and measurement controls AMP email requires.
Email Deliverability · Apr 23, 2019 · 11 min readYahoo Completed the AOL Mailbox Migration in 2019: One Delivery Ecosystem
A technical guide to the April 2019 Yahoo and AOL migration completion, its deliverability consequences and the evidence senders should use today.
Email Deliverability · Feb 23, 2019 · 12 min readYahoo and AOL Added One-Click Unsubscribe Support in 2019
An expert guide to Yahoo and AOL’s 2019 RFC 8058 support, secure POST handling, current bulk-sender requirements and durable suppression operations.
Email Deliverability · Dec 26, 2018 · 12 min readGmail Promotions Annotations in 2018: Inbox-Level Offer Presentation
A technical history and operating guide for Gmail Promotions annotations, structured offer data, eligibility, rendering, testing and honest measurement.