Solve: WebException , the remote name could not be resolved

Server Error in '/' Application.

---

The remote name could not be resolved: 'mail.aspdotnet-rajkumar.com/'

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Net.WebException: The remote name could not be resolved: 'mail.aspdotnet-rajkumar.com/'

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 

[WebException: The remote name could not be resolved: 'mail.aspdotnet-rajkumar.com/']    System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout) +5501831    System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback) +202    System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback) +21    System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout) +332    System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port) +160    System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port) +159    System.Net.Mail.SmtpClient.GetConnection() +35    System.Net.Mail.SmtpClient.Send(MailMessage message) +1213   [SmtpException: Failure sending mail.]    System.Net.Mail.SmtpClient.Send(MailMessage message) +1531    Contactus.SendSimpleEmail(String toAddressList, String subject, String emailBody, Boolean isHTML) +103   [Exception: Error sending email from admin@aspdotnet-rajkumar.com/]    Contactus.SendSimpleEmail(String toAddressList, String subject, String emailBody, Boolean isHTML) +161    Contactus.Sendadminmail(String name, String email, String Mobile) +222    Contactus.Submit_Click1(Object sender, EventArgs e) +83    System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111    System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110    System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10    System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13    System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

 

---

Version Information: Microsoft .NET Framework Version:2.0.50727.5448; ASP.NET Version:2.0.50727.5456