Email engineering, explained honestly.

Technical explainers on how email clients actually behave — Outlook’s GIF handling, Apple’s image proxies, format support — written by the team building DynaMail, limitations included.

Do countdown timers work in Outlook?

Countdown timers in email are images. Some Outlook for Windows setups freeze animated GIFs on the first frame — what that means, and how to handle it honestly.

August 18, 2026 · 7 min read

Apple Mail Privacy Protection and live email content

Apple Mail Privacy Protection prefetches email images through Apple relays. What that means for live email content, open-time rendering, and analytics.

August 18, 2026 · 5 min read

GIF vs APNG vs WebP vs PNG for email

GIF, APNG, WebP, or PNG for email images? The real client-support picture, quality and file-size tradeoffs, and simple rules for choosing a format.

August 18, 2026 · 6 min read