Send Mail in Unicode Format

 Im trying to send an email to yahoo for example in the code below in unicode format but it comes up as question marks. Please Help

 

  <script runat="server">

    protected void Button1_Click(object sender, EventArgs e)
    {

      Page.Validate();

    if(Page.IsValid)
    {

       MailMessage mail = new MailMessage();

       mail.To = "schsuae@yahoo.com";
       mail.Cc = "salwa@schs.ae";
       mail.From = "administrator@schs.ae";
       
       mai ...