C# 使用asp.net和google smtp服务器发送电子邮件

我在codebehind aspx页面中编写了以下代码来发送电子邮件。我想使用google smtp服务器。但有些人认为我没有收到邮件

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

---

我做错了什么？请帮助Gmail使用OAuth 2.0您可能需要提供某种API密钥才能访问其邮件功能

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

为了方便起见，使用IMAP访问邮件和使用SMTP发送邮件通常使用现有IMAP和SMTP库来完成。只要这些库支持简单身份验证和安全层（SASL），它们就应该与Gmail支持的SASL XOAUTH2机制兼容

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

除了SASL XOAUTH2协议文档之外，您可能还希望阅读使用OAuth 2.0访问Google API以获取有关实现OAuth 2.0客户端的更多信息

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

Libraries and Samples页面使用带有IMAP或SMTP的SASL XOAUTH2机制提供各种流行语言的代码示例。 （）

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

---

这是一个通用的电子邮件程序

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

它在端口=25时工作

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

记住gmail是一个IMAP服务器

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

  try 
  { 
           MailMessage msg = new MailMessage ();
           MailAddress fromAdd = new MailAddress("fromemail@email.com");
           msg.[To].Add("toemail@email.com");
           msg.Subject = "Choose Session Members";
           msg.From = fromAdd;
           msg .IsBodyHtml = true;
           msg.Priority = MailPriority.Normal;
           msg .BodyEncoding = Encoding.Default;
           msg.Body = "<center><table><tr><td><h1>Your Message</h1><br/><br/></td></tr>";
           msg.Body = msg.Body + "</table></center>";
           SmtpClient smtpClient = new SmtpClient ("smtp.yourserver.com", "25");
           smtpClient.EnableSsl = true;
           smtpClient.UseDefaultCredentials = false;
           smtpClient.Credentials = new System.Net.NetworkCredential("yourname@yourserver.com", "password");
           smtpClient .DeliveryMethod = SmtpDeliveryMethod.Network;
           smtpClient.Send(msg);
           smtpClient.Dispose();
        }

试试看
{ 
MailMessage msg=新的MailMessage（）；
MailAddress fromAdd=新邮件地址（“fromemail@email.com");
msg.[To]。添加（“toemail@email.com");
msg.Subject=“选择会话成员”；
msg.From=fromAdd；
msg.IsBodyHtml=true；
msg.Priority=MailPriority.Normal；
msg.BodyEncoding=Encoding.Default；
msg.Body=“您的邮件

”；
msg.Body=msg.Body+“”；
SmtpClient SmtpClient=新的SmtpClient（“smtp.yourserver.com”，“25”）；
smtpClient.EnableSsl=true；
smtpClient.UseDefaultCredentials=false；
smtpClient.Credentials=新系统.Net.NetworkCredential（“yourname@yourserver.com“，”密码“）；
smtpClient.DeliveryMethod=SmtpDeliveryMethod.Network；
smtpClient.Send（msg）；
smtpClient.Dispose（）；
}

首先，你检查过网络邮件了吗？在“已发送”文件夹中？许多年前，我也遇到了同样的问题，但我意识到我的防火墙阻止了我

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

还有一件事

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

SmtpClient类不支持隐式SSL。它支持显式SSL，这需要通过端口25与SMTP服务器建立不安全的连接，以便协商传输级别安全性（TLS）

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

资料来源：

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

---

关于

以下是您需要对SmtpClient对象执行的操作：

                protected void btnSubmit_Click(object sender, EventArgs e)
                {              
                // Sender e-mail address.
                MailAddress From = new MailAddress(txtFrom.Text);
                // Recipient e-mail address.
                MailAddress To = new MailAddress(txtTo.Text);
                MailMessage Msg = new MailMessage(From,To);
                Msg.Subject = txtSubject.Text;
                Msg.Body = txtBody.Text;
                // your remote SMTP server IP.
                SmtpClient client = new SmtpClient("smtp.gmail.com");
                client.Credentials = new System.Net.NetworkCredential
                 ("*******@gmail.com", "**********");
                client.EnableSsl = true;
                client.Port = 465;
                client.Send(Msg);
                client.Dispose();
                }

     SmtpClient client = new SmtpClient();
     client.DeliveryMethod = SmtpDeliveryMethod.Network;
     client.EnableSsl = true;
     client.Host = "smtp.gmail.com";
     client.Port = 587;
     client.Credentials = new System.Net.NetworkCredential("xxxx@gmail.com", "xxxx");

---

我认为gmail的端口是587而不是465，试着把它改为：client.port=587；