http://5ub5a23pmqnjtsbdbm6ursmojwvm3fnkhw6ielihgwonbtsmxw7scdid.onion/en/help/terms-service
Please read more about protecting your privacy at mullvad.net/help/first-steps-towards-online-privacy/. To protect ourselves, our customers, and the quality of our service, we block TCP port 25 because of email spam and ports 137, 138, 139, and 445 due to a Microsoft security issue. We also hijack DNS requests (port 53) in order to prevent DNS leaks.