In This Code i have send link : Code Here 

 string clientMachineName= (Dns.GetHostEntry(Request.ServerVariables["remote_addr"]).HostName);
                    strAcceptLink = "Leave Approval";
                    strAcceptLink = @"
                                       
                                            Please, click here for " + strAcceptLink + @"
                                       
                                    ";
                }


Now when other person get mailed and click on link error was generated .

For example : 
Login URL : http://Ke.CM-RV.com:8090/webforms/index.aspx -- 

I m login and send mail through my login Id then after  i opened mailed and click on that 
link at that time http://192.168.100.164/webforms/index.aspx --  this link opens but it gives error of HTTP Error 400 : 

Please help me in this.