Try this one :-
try
{
MailMessage mail = new MailMessage();
mail.To = toMail;
mail.From = "support@xyz.com";
mail.Subject = "Welcome to xyz!!";
mail.Body = table;
mail.BodyFormat = MailFormat.Html;
mail.Priority = MailPriority.High;
SmtpMail.SmtpServer = "localhost";
SmtpMail.Send(mail);
}
catch (Exception exe)
{
}