245557 Best Mail Server for Web2008

I am looking for a mail server working on Windows 2008 Web Server edition to manage mailing lists to my customers. I am looking for a product that will integrate well with SQL2005 for the list of users, and have an open API. I know [login to view URL] The task is to list at least 5 or 6 companies with similar products, including the price, the features, the API, the supported languages and databases. Contact support and ask, for each company, if Windows 2008 Web Server edition is supported, if SQL2005 is supported.