http://www.block-disposable-email.com/response_codes.php http://www.block-disposable-email.com/response_codes.php says: "MX does not exist": The corresponding

http://www.block-disposable-email.com/response_codes.php http://www.block-disposable-email.com/response_codes.php says: "MX does not exist": The corresponding domain does not have a mailexchanger (MX-DNS RR). Domains without a MX are not able to receive emails. No! Lack of an MX does NOT mean non-deliverable!