Transactional Email Testing Checklist: 40 Things People Forget
"It's just an email" — and then the password reset lands in spam, the welcome mail proudly reads "Hello, {{name}}", and the link expires before it even arrives. A first-person take: trigger and content, deliverability (SPF/DKIM/DMARC, spam), links and tokens, rendering in email clients (dark mode, images off, Gmail/Outlook), timing/duplicates/retries, localization and unsubscribe. With a flat checklist.