Uploaded website does not sent emails - asp.net

Question

I have uploaded my website to a known hosting server and i have a contact form, the weird thing is that when i run the website from visual studio (asp.net language) is sending the emails fine on my inbox.From the time that i uploaded it on the hosting server it gives the error: failure sending the email.I am using smtp.gmail.com, port:587,username and pass and ssl enabled.
protected void sendClientMail(string emailto)
{
try
{
var mail = new MailMessage
{
BodyEncoding = Encoding.UTF8,
From = new MailAddress(ConfigurationManager.AppSettings["MAILFROM"])
};
mail.To.Add(emailto);
mail.Bcc.Add(ConfigurationManager.AppSettings["MAILBCC"]); //sends to my email also
mail.Subject=ConfigurationManager.AppSettings["CLIENT-MAILSUBJECT"];
mail.IsBodyHtml = true;
#region //Load Email Control and get HTML string
string mailBody = "";
{
PrintPlaceHolder.Visible = true;
var sb = new StringBuilder();
var writer = new HtmlTextWriter(new StringWriter(sb));
var emailctl = LoadControl("~/Controls/ClientEmail.ascx") as ClientEmail;
if (emailctl != null)
{
emailctl.Name = txtName.Text;
emailctl.IntroName = txtName.Text + " " + txtSurname.Text;
emailctl.Surname = txtSurname.Text;
emailctl.Mobile = txtMobile.Text;
emailctl.Phone = txtPhone.Text;
emailctl.City = txtCity.Text;
emailctl.Street = txtStreet.Text;
emailctl.Message = txtmessage.Text;
emailctl.Email = txtEmail.Text;
emailctl.Country = ddlCountry.SelectedValue;
PrintPlaceHolder.Controls.Add(emailctl);
emailctl.RenderControl(writer);
}
mailBody = sb.ToString();
if (emailctl != null)
{
emailctl.Dispose();
}
writer.Dispose();
sb.Clear();
PrintPlaceHolder.Visible = false;
}
#endregion
mail.Body = mailBody;
//mail.Priority = MailPriority.High;
SmtpClient client = new SmtpClient();
client.Credentials = new NetworkCredential (ConfigurationManager.AppSettings["MAILFROM"], ConfigurationManager.AppSettings["PASS"]);
client.Host = ConfigurationManager.AppSettings["SMTPSERVER"];
client.Port = Convert.ToInt32(ConfigurationManager.AppSettings["SMTPPORT"]);
//client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.EnableSsl= false;
//client.UseDefaultCredentials = true;
client.Send(mail);
clearFields();
Response.Write("<script>alert('"+ConfigurationManager.AppSettings["MAILSUCCESS"]+"');</script>");
}
catch (Exception e)
{
Response.Write("<script>alert('"+ ConfigurationManager.AppSettings["MAILFAIL"] +" Error: "+e+"')</script>");
}
}//end method
Web.config file code:
<?xml version="1.0"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web>
<appSettings>
<add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
<add key="CLIENT-MAILSUBJECT" value="Mario Website - Confirmation Email"/>
<add key="MY-MAILSUBJECT" value="Mario Website - Email Sent"/>
<add key="MAILFROM" value="mariotec#mario26tech.com"/>
<add key="MAILBCC" value="nikolaou_marios#hotmail.com"/>
<add key="SMTPSERVER" value="sns41.win.hostgator.com"/>
<add key="SMTPPORT" value="26"/>
<add key="PASS" value="pass"/>
<add key="MAILSUCCESS" value="Email was sent successfully, thank you for your interest!!!"/>
<add key="MAILFAIL" value="There was an error while sending the email."/>
</appSettings>
<system.webServer>
<defaultDocument enabled="true">
<files>
<clear/>
<add value="Index.aspx"/>
</files>
</defaultDocument>
</system.webServer>
</configuration>
I have contacted the hosting provider without any help.
Thanks in advance.