google-material-design-icons/android/content/mail/materialiconstwotone/black/res/drawable/twotone_mail_24.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24"
    android:tint="?attr/colorControlNormal">
  <path
      android:fillColor="@android:color/white"
      android:pathData="M20,6H4l8,4.99zM4,8v10h16V8l-8,5z"
      android:strokeAlpha="0.3"
      android:fillAlpha="0.3"/>
  <path
      android:fillColor="@android:color/white"
      android:pathData="M20,4L4,4c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2L22,6c0,-1.1 -0.9,-2 -2,-2zM20,6l-8,4.99L4,6h16zM20,18L4,18L4,8l8,5 8,-5v10z"/>
</vector>