problem in send emails in asp.net

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ASP.NET

.NET

email

SMTP

i have a problem in sending emails...

i have a application i am using system.net.mail namespace
when i run my application in visual studio in my system its working perfectly..
but when i uploaded my site to server it creates problem emails are not sending when i use my site from there.. its very strange problem whole site working perfectly except this problem...

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Web.Mail;
using System.Net.Mail;


public class EmailManagment
{
    SmtpClient client = new SmtpClient();
    System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
    System.Net.NetworkCredential credentials = new System.Net.NetworkCredential("emailus@eventsitsolution.com", "mypassword");

    public void sendemail(string sendto, string subject, string body)
    {
        try
        {
            client.Host = "smtpout.secureserver.net";
            client.Port = 80;
            client.UseDefaultCredentials = false;
            client.Credentials = credentials;
            client.EnableSsl = false;
            // convert strings to mail address
            MailAddress to = new MailAddress(sendto);
            MailAddress from = new MailAddress("emailus@eventsitsolution.com");
            //
            msg.Subject = subject;
            msg.Body = body;
            msg.To.Add(to);
            msg.From = from;
            msg.IsBodyHtml = true;
     
            client.Send(msg);
        }
        catch (Exception ex)
        {
            ex.ToString();
        }
    }
}

when i want to send email i just call send email method.