mailcow/data/web/inc/lib/composer.json

{
    "require": {
        "robthree/twofactorauth": "^1.6",
        "yubico/u2flib-server": "^1.0",
        "phpmailer/phpmailer": "^5.2",
        "php-mime-mail-parser/php-mime-mail-parser": "^2.9",
        "soundasleep/html2text": "^0.5.0",
        "ddeboer/imap": "^1.5"
    }
}