diff --git a/app/src/main/res/layout/fragment_legend_messages.xml b/app/src/main/res/layout/fragment_legend_messages.xml
index b8198b662f..f5f5940a66 100644
--- a/app/src/main/res/layout/fragment_legend_messages.xml
+++ b/app/src/main/res/layout/fragment_legend_messages.xml
@@ -921,6 +921,29 @@
             app:layout_constraintStart_toEndOf="@id/ivBrokenImage"
             app:layout_constraintTop_toBottomOf="@id/tvTrackingPixel" />
 
+        <ImageView
+            android:id="@+id/ivExternal"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/title_legend_open_external"
+            android:padding="12dp"
+            app:layout_constraintBottom_toBottomOf="@+id/tvExternal"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="@id/tvExternal"
+            app:srcCompat="@drawable/twotone_open_in_new_24" />
+
+        <TextView
+            android:id="@+id/tvExternal"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:gravity="center_vertical"
+            android:minHeight="48dp"
+            android:text="@string/title_legend_open_external"
+            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toEndOf="@id/ivExternal"
+            app:layout_constraintTop_toBottomOf="@id/tvBrokenImage" />
+
         <ImageView
             android:id="@+id/ivDeletePermanent"
             android:layout_width="wrap_content"
@@ -942,6 +965,6 @@
             android:textAppearance="@style/TextAppearance.AppCompat.Medium"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toEndOf="@id/ivDeletePermanent"
-            app:layout_constraintTop_toBottomOf="@id/tvBrokenImage" />
+            app:layout_constraintTop_toBottomOf="@id/tvExternal" />
     </androidx.constraintlayout.widget.ConstraintLayout>
 </eu.faircode.email.ScrollViewEx>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 59ed758502..7286f0070a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1797,6 +1797,7 @@
     <string name="title_legend_embedded_image">Embedded image placeholder</string>
     <string name="title_legend_tracking_pixel">Tracking image</string>
     <string name="title_legend_broken_image">Broken image</string>
+    <string name="title_legend_open_external">Open outside the app</string>
 
     <string name="title_legend_pick">Pick contact</string>
     <string name="title_legend_cc">Show CC/BCC</string>