materialuiupgraded/packages/material-ui-icons/src/MarkunreadMailboxRounded.js

Material-UI's workspace package

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

export default createSvgIcon(
  <React.Fragment><path d="M20 6H10v5c0 .55-.45 1-1 1s-1-.45-1-1V4h5c.55 0 1-.45 1-1V1c0-.55-.45-1-1-1H7c-.55 0-1 .45-1 1v5H4c-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" /></React.Fragment>
, 'MarkunreadMailboxRounded');