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Monitoring & security, explained

Practical, no-fluff guides on uptime and security monitoring — fixing security headers, email authentication, SSL certificates, and consolidating your monitoring stack.
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All posts security 23 uptime 21 monitoring 19 incidents 18 outages 10 tls 9 https 9 dns 8 ssl 8 performance 8 email-security 6 security-headers 5
email-security deliverability

Why Are My Emails Going to Spam? A Developer's Deliverability Triage Guide

Emails going to spam? A step-by-step triage for developers — SPF/DKIM/DMARC alignment, IP and domain reputation, blacklists, and Gmail's bulk-sender rules.
· 6 min read
email-security dmarc

SPF, DKIM and DMARC Explained — and How to Stop Email Spoofing

A developer-friendly walkthrough of SPF, DKIM and DMARC — why p=none still leaves you spoofable, and how to roll out enforcement without breaking deliverability.
· 5 min read
email-security dkim

DKIM Key Rotation — Selectors, 2048-Bit Keys, and Zero-Downtime Swaps

How DKIM signing and selectors work, choosing 1024 vs 2048-bit keys, and a dual-selector DKIM key rotation process that swaps keys with zero downtime.
· 7 min read
email-security spf

The SPF 10-DNS-Lookup Limit — Why Your Email Authentication Silently Fails

The SPF 10-DNS-lookup limit silently breaks email authentication with permerror. How includes stack up, how to count lookups, and the fixes that work.
· 6 min read
email-security dmarc

Moving DMARC from p=none to p=reject — the Safe Migration Path

The safe way to move your DMARC policy from p=none to quarantine to p=reject — aggregate reports, pct= ramping, forwarder breakage and a realistic timeline.
· 6 min read
email-security deliverability

Gmail and Yahoo's New Sender Requirements — Your Four-Month Prep Checklist

Google and Yahoo will require SPF, DKIM, DMARC, one-click unsubscribe and sub-0.3% spam rates for bulk senders in February 2024. A prep checklist.
· 5 min read

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