C#通过smtp发送邮件

public MailMessage Initial(string Address)
        {
            MailMessage m_Mail = new MailMessage();
            //发件人
            m_Mail.From = new MailAddress("wawd74520@tom.com");
            //收件人
            m_Mail.To.Add(new MailAddress(Address));
            //主题
            m_Mail.Subject ="代理好久没验证了!!!";
            //内容
            m_Mail.Body = "赶紧重开一下吧!!!";
            //邮件主题和正文编码格式
            m_Mail.SubjectEncoding = System.Text.Encoding.UTF8;
            m_Mail.BodyEncoding = System.Text.Encoding.UTF8;
            //邮件正文是Html编码
            m_Mail.IsBodyHtml = true;
            //优先级
            m_Mail.Priority = System.Net.Mail.MailPriority.High;
            //添加附件,可以添加多个
            //m_Mail.Attachments.Add(new Attachment("f:\\1.txt"));
            //密件抄送收件人
            m_Mail.Bcc.Add(Address);
            //抄送收件人
            m_Mail.CC.Add(Address);

            return m_Mail;
        }

 private bool SendEmil()
        {