记一次邮件推送的坑，c#基于smtp使用腾讯企业邮箱发送邮件总是失败的原因

今天在弄企业邮箱推送的东西，原版代码是这样的

public void SendEmail(string title, string content)
        {
            try
            {
                MailMessage mailMsg = new MailMessage();
                mailMsg.To.Add(new MailAddress(ToEmails));
                mailMsg.From = new MailAddress(FromEmail);
                // 邮件主题
                mailMsg.Subject = title;
                // 邮件正文内容
                mailMsg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(content, null, MediaTypeNames.Text.Html));
                // 添加附件
                //string file = "D:\\1.txt";
                //Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
                //mailMsg.Attachments.Add(data);
                //邮件推送的SMTP地址和端口
                SmtpClient smtpClient = new SmtpClient(EmailHost, EmailPort);
                //SmtpClient smtpClient = new SmtpClient(EmailHost);
                // 使用SMTP用户名和密码进行验证
                System.Net.NetworkCredential credentials = new System.Net.NetworkCredential(FromEmail, FromEmailPW);
                smtpClient.EnableSsl = true;
                //smtpClient.Timeout = 10000;//超时
                smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtpClient.UseDefaultCredentials = false;
                smtpClient.Credentials = credentials;
                smtpClient.Send(mailMsg);
            }
            catch (Exception ex)
            {

                throw;
            }

        }

按照腾讯企业邮箱给的文档，我设置好邮箱账号、密码、smtp服务器、端口号之后开始测试，发现总是报错，当时腾讯企业邮箱的官方提示是这样的

可以看到，这里给的端口号是465，（这里不知道要不要骂娘了）

然后我断断续续的测试了一下午，发现怎么都发不出邮件，按理不会啊，就这么几行代码的事情，于是我试着删除一些配置，让程序按照自己的默认值来运行，于是我删除了端口号的配置，代码如下：

/// <summary>
        /// 
        /// </summary>
        /// <param name="UserName"></param>
        /// <param name="Money"></param>
        public void SendEmail(string title, string content)
        {
            try
            {
                MailMessage mailMsg = new MailMessage();
                mailMsg.To.Add(new MailAddress(ToEmails));
                mailMsg.From = new MailAddress(FromEmail);
                // 邮件主题
                mailMsg.Subject = title;
                // 邮件正文内容
                mailMsg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(content, null, MediaTypeNames.Text.Html));
                // 添加附件
                //string file = "D:\\1.txt";
                //Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
                //mailMsg.Attachments.Add(data);
                //邮件推送的SMTP地址和端口
                //SmtpClient smtpClient = new SmtpClient(EmailHost, EmailPort);
                SmtpClient smtpClient = new SmtpClient(EmailHost);
                // 使用SMTP用户名和密码进行验证
                System.Net.NetworkCredential credentials = new System.Net.NetworkCredential(FromEmail, FromEmailPW);
                smtpClient.EnableSsl = true;
                //smtpClient.Timeout = 10000;//超时
                smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtpClient.UseDefaultCredentials = false;
                smtpClient.Credentials = credentials;
                smtpClient.Send(mailMsg);
            }
            catch (Exception ex)
            {

                throw;
            }

        }

结果就发出去了，我是真的日了狗，邮件发送失败的提示的提示也没有具体信息，先记录一下，以后使用这些企业邮箱实现邮件推送，最好不要用他们提供的端口号，感觉只需要有发信服务器就行了。