Sending email to Inbox

Iam sendind email(s) with an Image(Image is an html view) from asp.net using system.net.mail by click in button, Iam takiingEmail Id's taking from Database.
When iam debugging from server,It is working perfectly.But when iam working through internet(in other system) it is giving an Exception  "Cannot get IIS pickup directory"

Please give me the solution.Thanks in advance......

string ToName=dtSelect.Rows[i][1].ToString();
                    string ToEmailID = dtSelect.Rows[i][2].ToString();
                    MailMessage mail = new MailMessage();
                    mail.To.Add(ToEmailID);
                    mail.Priority = MailPriority.High;
                    mail.From = new MailAddress("info@isitech.edu.in","ISiTech");
                    mail.Subject = "ISiTech BRIDGE Program";
                    string Body = "<b>Dear "+ToName+" !!!</b><br><img alt=\"\" hspace=0 src=\"cid:imageId\" align=baseline border=0 ><br> For More Details  www.isitech.edu.in";
                    AlternateView htmlView = AlternateView.CreateAlternateViewFromString(Body, null, "text/html");
                    LinkedResource imagelink = new LinkedResource(Server.MapPath(".") + @"\bridge.jpg", "image/jpeg");
                    imagelink.ContentId = "imageId";
                    imagelink.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;
                    htmlView.LinkedResources.Add(imagelink);
                    mail.AlternateViews.Add(htmlView);
                    SmtpClient smtp = new SmtpClient("Here I gave System IP Address", 25);
                    smtp.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;
                    smtp.Send(mail);

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