Do you have a mailing list? Do you collect email addresses? Are you tired of getting bounce backs every time you perform a mailing? aspNetMX will solve your email validation problems. aspNetMX is used to validate email addresses at different levels. aspNetMX can be used on signup forms or it can validate huge lists of email addresses from one address to millions. aspNetMX validates email addresses at four different levels. Syntax, MXRecords (Domain), SMTP, and Mailbox levels.