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SmtpServer error

Hi all
I can't seem to trace what is causing the SmtpServer to respond : " Mailbox unavailable. The server response was: sorry, no mailbox here by that name (#5.1.1) "

Stack Trace:

[SmtpFailedRecipientException: Mailbox unavailable. The server response was: sorry, no mailbox here by that name (#5.1.1)]
   System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) +1078355
   System.Net.Mail.SmtpClient.Send(MailMessage message) +1480
   prsnj.ReportSales.Submit_Click(Object sender, EventArgs e) +1349
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   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

I have also attached the code that sends the mail
Many thanks
MailDefinition md = new MailDefinition();
            string ReceipientAdddresss; 
            md.From = "form@mount.com";

            md.IsBodyHtml = true;
            md.Subject = "Report Repairs from " + your_name.Text;

            //Get Managers email
            ReceipientAdddresss = prsnj.bll.portfolio.GetManagersEmail(Convert.ToInt16(properties.SelectedItem.Value));

                ListDictionary replacements = new ListDictionary();
            replacements.Add("<%date%>", ReportDate.Text);
            replacements.Add("<%tenant_name%>", tenant_name.Text);
            replacements.Add("<%your_name%>", your_name.Text);
            replacements.Add("<%property%>", properties.SelectedItem.Text);

            if (SubDivision.Items.Count != 0)
                replacements.Add("<%SubDivision%>", SubDivision.SelectedItem.Text);
                replacements.Add("<%SubDivision%>", "None");

            replacements.Add("<%email%>", email.Text);
            replacements.Add("<%phone%>", phone.Text);
            replacements.Add("<%repair_type%>", repair_type.SelectedItem.Value.ToString());
            replacements.Add("<%description%>", description.Text);

            string body = "<html><body>" +
                "<table class=\"form\" cellspacing=\"0\" border=\"0\" align=\"center\">" +
                    "<tr>" +
                         "<th align=\"left\"><strong>Date </strong>:</th> <td><%date%></td>" +
                    "</tr><tr>" +
                         "<th align=\"left\"><strong>Tenant Name</strong>:</th> <td><%tenant_name%></td>" +
                    "</tr><tr>" +
                         "<th align=\"left\"><strong>Your Name</strong>:</th> <td><%your_name%></td>" +
                    "</tr><tr>" +
                          "<th align=\"left\"><strong>Property</strong>:</th> <td><%property%></td>" +
                     "</tr><tr>" +
                          "<th align=\"left\"><strong>SubDivision</strong>:</th> <td><%SubDivision%></td>" +
                    "</tr><tr>" +
                           "<th align=\"left\"><strong>Email</strong>:</th> <td><a href=\"mailto:<%email%>\"><%email%></a></td>" +
                    "</tr><tr>" +
                            "<th align=\"left\"><strong>Phone</strong>:</th> <td><%phone%></td>" +
                    "</tr><tr>" +
                            "<th align=\"left\"><strong>Repair Type</strong>:</th> <td><%repair_type%></td>" +
                    "</tr></table>" +
                "<p><strong>Description</strong>: <%description%></p>" +

            MailMessage msg = md.CreateMailMessage(ReceipientAdddresss, replacements,
                body, new System.Web.UI.Control()); 


            msg.Priority = MailPriority.Normal;

            SmtpClient mSmtpClient = new SmtpClient(ConfigurationManager.AppSettings["SmtpServer"]); //Set smtp in web.config file


            Status.Text = SuccessMsg;

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1 Solution
Your smtp server might require authentication and It does not seem you have set the credentials using  Credentials property. Set the valid credentials and try.

make sure SMTP server really exist on the value that you have on the web.config
What value do you get for ReceipientAdddresss =>
MailMessage msg = md.CreateMailMessage(ReceipientAdddresss, replacements,  
                body, new System.Web.UI.Control());  
Here is the description of your error:

SMTP Error 511 : Bad email address. This error is
similar to error 510 and as with error 510, this status code
is generated by the sender’s local mail server.
If the email was addressed internally, then it means that
the addressee, as written in the email’s TO, CC, or BCC
fields, does not exist in your organization’s email system.
simshpAuthor Commented:
Thanks for all the input .. but the 1st soln did the trick
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