diff --git a/app/src/main/java/eu/faircode/email/HtmlHelper.java b/app/src/main/java/eu/faircode/email/HtmlHelper.java
index 762f1efe21..31c8f78a13 100644
--- a/app/src/main/java/eu/faircode/email/HtmlHelper.java
+++ b/app/src/main/java/eu/faircode/email/HtmlHelper.java
@@ -894,6 +894,12 @@ public class HtmlHelper {
                             if (!text_font)
                                 continue;
 
+                            if (!TextUtils.isEmpty(value)) {
+                                List<String> faces = StyleHelper.getTypeFaces(value);
+                                if (faces.contains("monospace"))
+                                    element.attr("x-plain", "true");
+                            }
+
                             // https://developer.mozilla.org/en-US/docs/Web/CSS/font-family
                             sb.append(key).append(":").append(value).append(";");
                             break;
diff --git a/app/src/main/java/eu/faircode/email/StyleHelper.java b/app/src/main/java/eu/faircode/email/StyleHelper.java
index 17f172d18c..cf5050f5c2 100644
--- a/app/src/main/java/eu/faircode/email/StyleHelper.java
+++ b/app/src/main/java/eu/faircode/email/StyleHelper.java
@@ -1816,6 +1816,17 @@ public class StyleHelper {
         return new CustomTypefaceSpan(family, getTypeface(family, context));
     }
 
+    static List<String> getTypeFaces(String family) {
+        List<String> faces = new ArrayList<>();
+        for (String face : family.split(","))
+            faces.add(face
+                    .trim()
+                    .toLowerCase(Locale.ROOT)
+                    .replace("'", "")
+                    .replace("\"", ""));
+        return faces;
+    }
+
     static Typeface getTypeface(String family, Context context) {
         if (TextUtils.isEmpty(family))
             return Typeface.DEFAULT;
@@ -1824,15 +1835,8 @@ public class StyleHelper {
         boolean bundled_fonts = prefs.getBoolean("bundled_fonts", true);
         boolean narrow_fonts = prefs.getBoolean("narrow_fonts", false);
 
-        List<String> faces = new ArrayList<>();
-        for (String face : family.split(","))
-            faces.add(face
-                    .trim()
-                    .toLowerCase(Locale.ROOT)
-                    .replace("'", "")
-                    .replace("\"", ""));
-
         try {
+            List<String> faces = getTypeFaces(family);
 
             if (faces.contains("fairemail"))
                 return ResourcesCompat.getFont(context.getApplicationContext(), R.font.fantasy);