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4.3.1 The server specified in the SmtpServer property is not valid or not available Printer Friendly Email This FAQ Discuss

Make sure the value specified at

SmtpMail.SmtpServer

Is a valid SMTP Server
Check to be sure the server System.Web.Mail is executing on can connect to the mail server. Some times firewalls or proxy servers can get in the way.
Try specifying the value by IP address. Poor DNS resolution can sometimes hinder name lookups.
Make sure the that the mail server is running at port 25

The formatted version of this faq can be found at http://www.SystemWebMail.com/faq/4.3.1.aspx