.NET實現發送郵件

 注意：需要找到“POP3/SMTP服務”並開啟，然后生成授權碼，生成的授權碼就是下面登入的密碼。

/// <summary>
    /// 發送郵件
    /// </summary>
    /// <param name="to">收件人（多人由;隔開）</param>
    /// <param name="title">標題</param>
    /// <param name="content">內容</param>
    /// <param name="cc">抄送</param>
    /// <returns></returns>
    public string sendEmail(string to, string title, string content, string cc = "")
    {
        try
        {
            System.Net.Mail.MailMessage myMail = new System.Net.Mail.MailMessage();
            myMail.From = new System.Net.Mail.MailAddress("[e-mail]","xx通知", System.Text.Encoding.UTF8); //發件人地址，發件人姓名，編碼
            string[] tos = to.Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries);
            for (int i = 0; i < tos.Length; i++)
            {
                myMail.To.Add(new System.Net.Mail.MailAddress(tos[i]));
            }
            string[] ccs = cc.Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries);
            for (int i = 0; i < ccs.Length; i++)
            {
                myMail.CC.Add(new System.Net.Mail.MailAddress(ccs[i]));
            }
            myMail.Subject = title;
            myMail.SubjectEncoding = Encoding.UTF8;
            myMail.Body = content;
            myMail.BodyEncoding = Encoding.UTF8;
            myMail.IsBodyHtml = true;
            System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient();
            smtp.Host = "smtp.qq.com";
            smtp.EnableSsl = true;
            smtp.UseDefaultCredentials = false;
            smtp.Credentials = new System.Net.NetworkCredential("[e-mail]", "password");
            smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
            smtp.Send(myMail);
            return "";
        }
        catch (Exception ee)
        {
            return ee.ToString();
        }
    }