Articles
Why Are My Emails Going to Spam? A Developer's Deliverability Triage Guide
A step-by-step deliverability triage for developers covering SPF/DKIM/DMARC alignment, IP and domain reputation, blocklists, and bulk-sender rules.
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.
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.
Moving DMARC from p=none to p=reject: the Safe Migration Path
How to move a DMARC policy from p=none to quarantine to p=reject safely, with aggregate reports, pct= ramping, forwarder breakage and a realistic timeline.
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.
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