diff --git a/src/paperless_mail/parsers.py b/src/paperless_mail/parsers.py
index ed084618a..ccfdfe3a3 100644
--- a/src/paperless_mail/parsers.py
+++ b/src/paperless_mail/parsers.py
@@ -296,22 +296,26 @@ class MailDocumentParser(DocumentParser):
 
         return response.content
 
-    def transform_inline_html(self, orig_html, attachments):
+    @staticmethod
+    def transform_inline_html(html, attachments):
         def clean_html_script(text: str):
-            text = text.replace("<script", "<div hidden ")
-            text = text.replace("</script", "</div")
+            compiled_open = re.compile(re.escape("<script"), re.IGNORECASE)
+            text = compiled_open.sub("<div hidden ", text)
+
+            compiled_close = re.compile(re.escape("</script"), re.IGNORECASE)
+            text = compiled_close.sub("</div", text)
             return text
 
-        orig_html = clean_html_script(orig_html)
+        html_clean = clean_html_script(html)
         files = []
 
         for a in attachments:
             name_cid = "cid:" + a.content_id
             name_clean = "".join(e for e in name_cid if e.isalnum())
             files.append((name_clean, BytesIO(a.payload)))
-            orig_html = orig_html.replace(name_cid, name_clean)
+            html_clean = html_clean.replace(name_cid, name_clean)
 
-        files.append(("index.html", StringIO(orig_html)))
+        files.append(("index.html", StringIO(html_clean)))
 
         return files
 
diff --git a/src/paperless_mail/tests/samples/sample.html b/src/paperless_mail/tests/samples/sample.html
new file mode 100644
index 000000000..3aa5f615d
--- /dev/null
+++ b/src/paperless_mail/tests/samples/sample.html
@@ -0,0 +1,15 @@
+ <html>
+    <head>
+      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+    </head>
+    <body>
+      <p>Some Text</p>
+      <p><img src="cid:part1.pNdUSz0s.D3NqVtPg@example.de" alt=""></p>
+      <p>and an embedded image.<br>
+      </p>
+      <p id="changeme">Paragraph unchanged.</p>
+      <scRipt>
+          document.getElementById("changeme").innerHTML = "Paragraph changed via Java Script.";
+      </script>
+    </body>
+  </html>
diff --git a/src/paperless_mail/tests/samples/sample.png b/src/paperless_mail/tests/samples/sample.png
new file mode 100644
index 000000000..162aadad0
Binary files /dev/null and b/src/paperless_mail/tests/samples/sample.png differ
diff --git a/src/paperless_mail/tests/test_eml.py b/src/paperless_mail/tests/test_eml.py
index a0f4c0b77..cfbe31edb 100644
--- a/src/paperless_mail/tests/test_eml.py
+++ b/src/paperless_mail/tests/test_eml.py
@@ -282,3 +282,27 @@ class TestParser(TestCase):
         # Check successful parsing
         parsed = parser.tika_parse(html)
         self.assertEqual(expected_text, parsed)
+
+    def test_transform_inline_html(self):
+        class MailAttachmentMock:
+            def __init__(self, payload, content_id):
+                self.payload = payload
+                self.content_id = content_id
+
+        parser = MailDocumentParser(None)
+
+        result = None
+
+        with open(os.path.join(self.SAMPLE_FILES, "sample.html")) as html_file:
+            with open(os.path.join(self.SAMPLE_FILES, "sample.png"), "rb") as png_file:
+                html = html_file.read()
+                png = png_file.read()
+                attachments = [
+                    MailAttachmentMock(png, "part1.pNdUSz0s.D3NqVtPg@example.de"),
+                ]
+                result = parser.transform_inline_html(html, attachments)
+
+        resulting_html = result[-1][1].read()
+        self.assertTrue(result[-1][0] == "index.html")
+        self.assertTrue(result[0][0] in resulting_html)
+        self.assertFalse("<script" in resulting_html.lower())
