diff --git a/addons/mass_mailing/static/src/js/mass_mailing_snippets.js b/addons/mass_mailing/static/src/js/mass_mailing_snippets.js
index de34cd73cb6..c93f74861f3 100644
--- a/addons/mass_mailing/static/src/js/mass_mailing_snippets.js
+++ b/addons/mass_mailing/static/src/js/mass_mailing_snippets.js
@@ -197,6 +197,23 @@ options.registry.BackgroundImage = options.registry.BackgroundImage.extend({
 
 options.registry.ImageTools.include({
 
+    //--------------------------------------------------------------------------
+    // Public
+    //--------------------------------------------------------------------------
+
+    /**
+     * @override
+     */
+    async updateUIVisibility() {
+        await this._super(...arguments);
+
+        // Transform is _very_ badly supported in mail clients. Hide the option.
+        const transformEl = this.el.querySelector('[data-transform="true"]');
+        if (transformEl) {
+            transformEl.classList.toggle('d-none', true);
+        }
+    },
+
     //--------------------------------------------------------------------------
     // Private
     //--------------------------------------------------------------------------