Validate Pro lets you validate email addresses from a list or on your website without sending anything to the user. Validate Pro comes with a sophisticated desktop application capable of handling large volumes of addresses or can be integrated into your website to check addresses on-the-fly using the popular Microsoft ASP or Java JSP programming languages (Source code examples included). Validate Pro does more than basic email syntax checking, it also does munge detection, TLD verification, DNS resolution (and caching), and MX server querying.