Marketing Template · Adapted from MJML (MIT)

Tech Geek Weekly

Overall compatibility: 89/100 across 21 email clients · 20 of 21 clients passing (1 clean at 100%) · 317 compatibility warnings (0 error-level) · 35.4KB compiled HTML.

Cross-client fidelity Tested against 21 email clients. 1 of 21 clients render cleanly with 100% fidelity. Only Outlook Classic has reduced fidelity (52/100) due to legacy desktop engine constraints.

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Attribution · MJML Open Source

Template adapted from the official MJML email-templates repository under the MIT License (© Mailjet / Sinch). Raw .mjml source code is included.

Client Compatibility

Score: 89/100 · 20/21 passing

21 clients tested

Apple Mail 100/100

Apple Mail iOS 97/100

Samsung Mail 97/100

Superhuman 97/100

Thunderbird 94/100

HEY Mail 94/100

Fastmail 94/100

Outlook 365 91/100

Outlook (New) 91/100

Outlook iOS 91/100

Outlook Android 91/100

Outlook for Mac 91/100

Gmail 88/100

Gmail Android 88/100

Gmail iOS 88/100

Yahoo Mail 88/100

Yahoo Mail Android 88/100

Proton Mail 88/100

Yahoo Mail iOS 85/100

AOL Mail 85/100

Outlook Classic 52/100

1 of 21 clients render with 100% fidelity. Lowest is 52/100 in Outlook Classic due to legacy desktop styling limitations.

Notes on this template

It opens: "Your monthly tech news, in your inbox. Newsletter #01 - Month Year Computer The new Macbook, is it worth it? Discover the latest Macbook's features, performance, and price. We analyze if it's a worthy upgrade for your needs. Read more...". Links: "Ricardo Freire". 4 images, 35 Outlook-only blocks, no dark-mode query, web font.

The spread is what matters on this template: 100 in Apple Mail against 52 in Outlook Classic, a 48-point gap across the same file. 1 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 317 warnings behind that score are concentrated there rather than spread evenly.

At 35.4KB compiled it has roughly 67KB 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: Imagery, colour and section order. This is the one category where restructuring is expected, and the per-client table on this page is how you check the restructure survived.

Leave alone: The image widths declared as HTML attributes as well as CSS. Outlook reads the attribute and ignores the stylesheet, so an image sized only in CSS renders at its natural pixel width and blows the layout out sideways.

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

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