Email Address Validation Class

Hello, I require an email address validation class written in VB.Net or C# (VB.net preferred). The Class validates the authenticity of an email address. This validation extends beyond simple regular expression validation, it need to communicate over the network with the host SMTP domain, validating the existence of the address and ultimately the validity of the target email address. An email address is considered valid if an email message can successfully be sent to it without the target SMTP server returning an error message. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform VB.Net or C# (VB.net preferred)