Skip to main content
Emailens

Product Update · Protocol

Overall compatibility: 96/100 across 21 email clients · 20 of 21 clients passing (6 clean at 100%) · 159 compatibility warnings (0 error-level) · 20.6KB compiled HTML.

Cross-client fidelity Tested against 21 email clients. 6 of 21 clients render cleanly with 100% fidelity. Only Outlook Classic has reduced fidelity (70/100) due to legacy desktop engine constraints.
email://preview/ protocol-product-update.html
RE

Attribution · React Email

Template adapted from the open-source React Email collection under the MIT License (© Plus Five Five, Inc. / Resend). Full React source code is included.

Client Compatibility

Score: 96/100 · 20/21 passing

21 clients tested
6 of 21 clients render with 100% fidelity. Lowest is 70/100 in Outlook Classic due to legacy desktop styling limitations.

Notes on this template

It opens: "THE WORK BEHIND THE WORK Here from the Dither team. This month was about making Dither feel smoother, faster, and easier to use in everyday work. We shipped new features, improved key workflows, and made small but meaningful updates that...". Preheader: "What's new in Dither". Links: "Explore Smart Tasks", "Read more". 9 images, 0 Outlook-only blocks, no dark-mode query, web font.

The spread is what matters on this template: 100 in Superhuman against 70 in Outlook Classic, a 30-point gap across the same file. 6 of the 21 clients render it without a single flagged property. Outlook Classic is the one to preview against after any edit, because it is where this template has the least margin, and the 159 warnings behind that score are concentrated there rather than spread evenly.

At 20.6KB compiled it has roughly 81KB of headroom before Gmail clips the message at 102KB and hides the rest behind a "View entire message" link. Inlined CSS and base64 images both count toward that, so watch it as you add sections.

Safe to customise: Body copy, screenshots and the changelog list. Product mail is usually the longest thing a team sends, which makes the size figure below the one to watch as you add sections.

Leave alone: The heading hierarchy. It carries the document outline that screen readers announce, and flattening every heading to styled text is the most common accessibility regression in this category.

Modified it? Check your version against the same 21 clients.

Zero-Friction Engine Preview

Test your email in Gmail, Outlook and Apple Mail

Preview rendering, catch CSS issues, and see what Outlook does to your VML. Free, no account. All 21 clients with one.

Try Emailens Free

Instant live preview · No signup required · 21 email engines