SMTP发送邮件中STARTTLS问题

[mcopro]

照网上的例子在自己的程序里面加上联系作者的东东，测试时用我另外的GMAIL发送邮件时抛出错误：
5.7.0 Must issue a STARTTLS command first. b7sm1861523tic.23
如何解决？？

        private void sendMail(string addr,string pass, string mess, string smtp)
        {
            try
            {
                MailMessage msg = new MailMessage();
                msg.From = new MailAddress(addr);
                msg.To.Add("[e-mail]");
                msg.Subject = "From CardDB";
                msg.SubjectEncoding = Encoding.UTF8;
                msg.Body = mess;
                msg.BodyEncoding = Encoding.UTF8;
                msg.IsBodyHtml = true;
                SmtpClient scMailServer = new SmtpClient();
                scMailServer.DeliveryMethod = SmtpDeliveryMethod.Network;
                scMailServer.Credentials = new NetworkCredential(addr.Substring(0, addr.IndexOf('@') - 1), pass);
                scMailServer.Host = smtp;
                scMailServer.Port = 25;
                scMailServer.Send(msg);
                MessageBox.Show("邮件已经成功发送！", "CardDB", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show("发送遇到错误：" + ex.Message + "\n请重试。", "CardDB", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

[mykelly6]

要求ssl验证好像在客户端无法发送的吧

[路人乙e]

[Quote=引用 3 楼 mcopro 的回复:]
这……晕死，谁给个SSL发邮件的例子啊……
[/Quote]
very easy
scMailServer.EnableSsl = true;

[core0]

http://dev.csdn.net/article/51/51402.shtm

C#使用CDO发送邮件，我使用过，确实不错

[mcopro]

换端口也好像不行……换了发好像死机……

[路人乙e]

gmail.smtp要求ssl验证

[mcopro]

这……晕死，谁给个SSL发邮件的例子啊……