Signal notes · 2026
Turn email problems into verifiable steps
From pre-launch HTML template checks to diagnosing verification-code delays, replace blind resends and screenshot guesswork with reproducible evidence.
Latest notes
Email Testing & Delivery Guides
Regularly updated with practical guidance on real sending, email rendering, and delay diagnosis.
2 articlesHTML Email Rendering Checklist: From Headers to Mobile
Turn a design into a production-ready email by checking headers, layout, images, buttons, and plain-text fallbacks one by one.
Read the full guideVerification Email Not Arriving? How Long to Wait Before Resending
Troubleshoot the sender, queue, inbox rules, and address validity to avoid adding noise with repeated requests.
Read the full guideHow to read the guides
Every guide ends with one real send
Define the variables you need to verify, preserve timing, client, and header evidence, then resend the corrected template to a dedicated inbox.