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

小灰灰 2021-12-12 02:49 2076阅读 0赞

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

![1107859-20190511230639127-722894543.png][]

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。

转载于:https://www.cnblogs.com/yuchenghao/p/10850518.html

[1107859-20190511230639127-722894543.png]: /images/20211211/68c0d33105f04371952100f12d2c1acf.png