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信息: <blockquote data-quote="JohnH" data-source="post: 4554" data-attributes="member: 4">What exception is that, and is that the exact exception message? Possible exceptions are listed here: <a href="http://msdn.microsoft.com/en-us/library/swas0fwc(v=vs.110).aspx">SmtpClient.Send Method (MailMessage) (System.Net.Mail)</a>, notice especially this remark:See this for example checking all wrapped exceptions: <a href="http://www.systemnetmail.com/faq/5.aspx">Troubleshooting System.Net.Mail</a></blockquote>