Why Emails Look Different in Gmail and Outlook

Your email looks balanced in the editor. After a test send, a colleague sees different spacing, a missing background and a button that wraps. Email rendering turns one HTML document into several experiences, depending on the application receiving it.

The useful question is whether the message remains readable and actionable across the clients your audience uses. A layout can tolerate a slightly different corner radius. It cannot tolerate a hidden price or an unreachable registration link.

Understand what changes between preview and inbox

An editor preview shows a document in a browser environment. A delivered message also passes through your sending system and the receiving application’s handling of HTML, styles and remote content. Diagnose those stages separately.

Start by comparing the exported HTML with the message your sender actually produces. Check whether link rewriting, a footer or template substitution changes the document. If the export is correct but the received result differs, record the exact receiving application and version before changing the template.

Gmail supports a documented selection of CSS and media queries; a browser feature is not automatically an email feature. Use the Gmail CSS reference when a property seems to disappear.

Treat Outlook as several test environments

“Outlook” is too broad to describe a rendering result. Classic Outlook for Windows, new Outlook, the web application and mobile applications deserve separate entries in your test notes.

Microsoft documents a Word-based HTML validation path for classic Outlook’s object-model composition. That evidence does not describe every product carrying the Outlook name. The new Outlook architecture uses WebView2 and the Outlook web experience.

Ask your colleague for the application, operating system, window size and screenshot. “Outlook on Windows, classic desktop application” is a useful starting point. “It is broken in Microsoft” is difficult to reproduce. Keep a successful baseline message so future changes have a comparison.

Build a hierarchy that survives small differences

Choose a restrained structure: a clear heading, readable text, a meaningful image and one primary action. Decorative styling should support that structure. Important information should remain available when a background image or preferred font is unavailable.

For a webinar invitation, put the event name, date and registration action in ordinary HTML text. A decorative hero can establish atmosphere, but it should not contain the only copy of the schedule. Include a readable fallback font and let button labels wrap without clipping.

A supported layout table can be a useful email technique, but tables do not make every CSS declaration reliable. Keep structure simple and test the generated document. Avoid changing the entire template because one decorative effect differs in one client.

Work through a rendering failure methodically

Suppose a two-column announcement becomes cramped on a phone and its button loses rounded corners on a desktop client. Prioritize the cramped content because it affects comprehension.

1. Send a reduced version containing the affected section through the real sender.
2. Confirm whether the columns stack in a sensible reading order.
3. Check images, long URLs and fixed widths for overflow.
4. Replace nonessential decoration with a simpler fallback.
5. Repeat the same send and compare the same client configurations.

Change one cause at a time. Record the template revision, client and result. A screenshot without that context is weak evidence for a fix, especially when different teammates use different applications.

Make delivered-message review part of release

Keep a small test matrix informed by your audience. Include wide and narrow views, images disabled where possible, and the dark appearance settings recipients actually use. Test the final personalized message rather than only placeholder content.

In Weavour, desktop and mobile previews help you inspect the design while editing. Your application’s sending system completes the delivery path, so a real mailbox test remains necessary. A successful browser preview does not establish universal rendering compatibility.

Before releasing the next template, agree on what must remain consistent: reading order, important text, accessible actions and the message’s meaning. Allow harmless visual variation, document actual failures and preserve the tested version. Explore Weavour to see how visual editing can fit inside your SaaS workflow.