I believe they are literally trying to write a WebMail service and, if that is the case, you can not use the SMTP service that is installed with IIS.
That service will not allow you to create alias's, mailboxes, address books, etc. You will need to have a mail server behind your web application to implement this correctly.
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Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
^^Took that from planoie's profile^^
^^Modified text taken from gbianchi profile^^
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Technical Editor for:
Professional Search Engine Optimization with ASP.NET
http://www.wiley.com/WileyCDA/WileyT...470131470.html
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Why can't Programmers, program??
http://www.codinghorror.com/blog/archives/000781.html
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