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How to Fix CSS Grid Broken Columns in Apple Mail (Desktop)
for HubSpot Campaigns

A programmatic integration guide for resolving email rendering crashes inside Apple Mail (Desktop) using HubSpot's layout editor environment.

Root Bug Analysis

Apple Mail (Desktop) uses the WebKit which lacks support for standard rendering rules. This causes CSS Grid Broken Columns elements to break or collapse when rendering templates.

Active rendering engine: WebKit

HubSpot Specific Guide

HubSpot's delivery wrapper can clean and restructure elements during import, creating dynamic spacing differences inside Apple Mail (Desktop).

Integration Step:

In HubSpot's Design Manager, edit the modules section. Create a 'Rich Text' or 'HTML' module block. Double-click the block, choose 'Tools' or 'Advanced', click 'Source Code', and drop the code snippet inside.

ESP Unsubscribe Alignment

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

HubSpot Unsubscribe Tag:{{ unsubscribe_link }}

Documented Client Behavior

Expected layout behavior based on target rendering engine specifications:

Documented behavior: CSS Grid Broken Columns causes elements to stack vertically or clip in Apple Mail (Desktop) when templates are sent from HubSpot.

Interactive HubSpot Custom Sandbox

Target Environment: Apple Mail (Desktop)

Auto-compile fixes inside RenderOps Workspace

Load layout code directly into our Flexbox→Table Compiler to compile responsive table frameworks that display cleanly in Apple Mail (Desktop).

Launch Flexbox→Table Compiler

Fix CSS Grid Broken Columns on Other clients for HubSpot