def pkginfo_unicode(pkg_info, field):
    """Hack to coax Unicode out of an email Message() - Python 3.3+"""
    text = pkg_info[field]
    field = field.lower()
    if not isinstance(text, str):
        for item in pkg_info.raw_items():
            if item[0].lower() == field:
                text = item[1].encode('ascii', 'surrogateescape').decode(
                    'utf-8')
                break
    return text
