public bool SendMail(string from, string to, string subject, string body, string smthost, string username, string userpass)
{
    try
    {
        string[] strArray = to.Split(new char[] { ',' });
        foreach (string str in strArray)
        {
            MailMessage message = new MailMessage();
            message.From = new MailAddress(from);
            message.To.Add(new MailAddress(str.Trim()));
            message.Subject = subject;
            message.Body = body;
            message.IsBodyHtml = true;
            SmtpClient client = new SmtpClient();
            client.Host = smthost;
            client.UseDefaultCredentials = true;
            client.Credentials = new NetworkCredential(username, userpass);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.Send(message);
        }
        return true;
    }
    catch
    {
        return false;
    }
}

------解决方案--------------------
晕，发错了。顶楼主一下。

------解决方案--------------------
自个写pop3，跟发邮件一样简单。

------解决方案--------------------
学习

------解决方案--------------------
mark