How to Fix CSS Flexbox Collapse in Apple Mail (Desktop)
for Mailchimp Campaigns
A programmatic integration guide for resolving email rendering crashes inside Apple Mail (Desktop) using Mailchimp's layout editor environment.
Root Bug Analysis
Apple Mail (Desktop) uses the WebKit which lacks support for standard rendering rules. This causes CSS Flexbox Collapse elements to break or collapse when rendering templates.
Mailchimp Specific Guide
Mailchimp's delivery wrapper can clean and restructure elements during import, creating dynamic spacing differences inside Apple Mail (Desktop).
Locate your campaign block inside Mailchimp. Drag a 'Code' block into your canvas workspace. Toggle the editor view to Source, paste the optimized code, and click Save.
ESP Unsubscribe Alignment
When compiling custom HTML templates for Mailchimp, you must ensure your layout retains deliverability compliance loops. Mailchimp requires you to insert their specific unsubscribe merge tag, otherwise your campaign delivery will be flagged by automated spam audits.
*|UNSUB|*Documented Client Behavior
Expected layout behavior based on target rendering engine specifications:
Auto-compile fixes inside RenderOps Workspace
Load layout code directly into our Retrofit Compiler to compile responsive table frameworks that display cleanly in Apple Mail (Desktop).