diff --git a/packages/renderer/HtmlToHtml.test.ts b/packages/renderer/HtmlToHtml.test.ts
index 6f0e1648bb..6db71e9846 100644
--- a/packages/renderer/HtmlToHtml.test.ts
+++ b/packages/renderer/HtmlToHtml.test.ts
@@ -32,6 +32,19 @@ describe('HtmlToHtml', () => {
 					css: '',
 				},
 			],
+			// cSpell:disable
+			[
+				`<style></style>
+<p><br></p><div class="moz-forward-container"><br><br>-------- Message transféré --------<table class="moz-email-headers-table" cellspacing="0" cellpadding="0" border="0"><tbody><tr><th valign="BASELINE" nowrap="nowrap" align="RIGHT">Sujet&nbsp;:</th><td>
+Your car rental booking DC-7706328 is confirmed (pick-up on 1 October 2024)</td></tr></tbody></table><style type="text/css"></style>`,
+				{
+					html: `
+<p><br></p><div class="moz-forward-container"><br><br>-------- Message transféré --------<table class="moz-email-headers-table" cellspacing="0" cellpadding="0" border="0"><tbody><tr><th valign="BASELINE" nowrap="nowrap" align="RIGHT">Sujet&nbsp;:</th><td>
+Your car rental booking DC-7706328 is confirmed (pick-up on 1 October 2024)</td></tr></tbody></table><style type="text/css"></style>`,
+					css: '',
+				},
+			],
+			// cSpell:enable
 		];
 
 		for (const t of testCases) {
diff --git a/packages/renderer/HtmlToHtml.ts b/packages/renderer/HtmlToHtml.ts
index abd4d99ed0..d5ba506318 100644
--- a/packages/renderer/HtmlToHtml.ts
+++ b/packages/renderer/HtmlToHtml.ts
@@ -180,7 +180,7 @@ export default class HtmlToHtml implements MarkupRenderer {
 	}
 }
 
-const splitHtmlRegex = /^<style>([\s\S]*)<\/style>([\s\S]*)$/i;
+const splitHtmlRegex = /^<style>([\s\S]*?)<\/style>([\s\S]*)$/i;
 
 // This function is designed to handle the narrow case of HTML generated by the
 // HtmlToHtml class and used by the Rich Text editor, and that's with the STYLE