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Outlook Email Broken Layout Fix: Resolve Custom Font Fallback Overrides

A programmatic integration guide for resolving email rendering crashes inside Outlook 2013 using Campaign Monitor's layout editor environment.

Root Bug Analysis

Outlook 2013 uses the Microsoft Word (MSO) which lacks support for standard rendering rules. This causes Custom Font Fallback Overrides elements to break or collapse when rendering templates.

Active rendering engine: Microsoft Word (MSO)

Campaign Monitor Specific Guide

Campaign Monitor's delivery wrapper can clean and restructure elements during import, creating dynamic spacing differences inside Outlook 2013.

Integration Step:

In Campaign Monitor, click the 'Source' button on your selected editable text region, or edit the template code files directly. Ensure you append the 'class="cs-editable"' flag if you need inline editing later.

ESP Unsubscribe Alignment

When compiling custom HTML templates for Campaign Monitor, you must ensure your layout retains deliverability compliance loops. Campaign Monitor requires you to insert their specific unsubscribe merge tag, otherwise your campaign delivery will be flagged by automated spam audits.

Campaign Monitor Unsubscribe Tag:[unsubscribe]

Documented Client Behavior

Expected layout behavior based on target rendering engine specifications:

Documented behavior: Custom Font Fallback Overrides causes elements to stack vertically or clip in Outlook 2013 when templates are sent from Campaign Monitor.

Interactive Campaign Monitor Custom Sandbox

Target Environment: Outlook 2013

Paste Your Broken Code

<body style="font-family: 'Montserrat', sans-serif;">
  <h1>Custom Title</h1>
</body>

RenderOps Compiled Output

<!-- Paste code on the left and click compile to output clean fallback tags -->

Auto-compile fixes inside RenderOps Workspace

Load layout code directly into our Font Stack Builder to compile responsive table frameworks that display cleanly in Outlook 2013.

Launch Font Stack Builder