@activelylearn/material-ui/packages/material-ui-icons/src/MarkunreadMailbox.js

Material-UI's workspace package

import React from 'react';
import createSvgIcon from './utils/createSvgIcon';

export default createSvgIcon(
  <g><path d="M20 6H10v6H8V4h6V0H6v6H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V8c0-1.1-.9-2-2-2z" /></g>
, 'MarkunreadMailbox');