System.Net.Mail.SmtpException {"Failure Sending Email."}

Question

在 client.Send(email); 处不断崩溃并出现上述错误。四重检查一切。

这是我的代码：

private void submit_Click(object sender, RoutedEventArgs e)
{
    string from = "************@gmail.com";
    string to = "*******@sru.edu";
    string subject = "PSLM Test";
    string body = "PSLM Test";
    string server = "smtp.gmail.com";
    int port = 465;
    string username = "************";
    string password = "*******";

    SmtpClient client = new SmtpClient(server, port);
    client.Credentials = new NetworkCredential(username, password);

    MailMessage email = new MailMessage(from, to, subject, body);

    email.Attachments.Add(new Attachment(GlobalVariables.attachedFilePath));
    email.Attachments.Add(new Attachment(GlobalVariables.formsAndTemplatesPath[0]));
    email.Attachments.Add(new Attachment(GlobalVariables.formsAndTemplatesPath[1]));
    email.Attachments.Add(new Attachment(GlobalVariables.formsAndTemplatesPath[2]));

    client.Send(email);
}

请问我做错了什么？

Answer 1

Gmail SMTP 端口是 587，不是 465。您还需要将 SmtpClient.EnableSsl 属性设置为 true。

client.EnableSsl = true;

在设置新的网络凭据之前，可能您可能需要将 client.UseDefaultCredentials 设置为 false。但情况并非总是如此——我所知道的是，当其他选择都用尽时，这往往会奏效。

client.UseDefaultCredentials = false;
client.Credentials = new NetworkCredential(username, password);

由于您使用的是 gmail，因此您需要在 google 帐户安全设置中允许安全性较低的应用程序。如果您使用双因素身份验证，您还需要创建一个应用程序专用密码，并在您的代码中使用它。

Answer 2

    SmtpClient client= new SmtpClient(server, port);

    client.Credentials = new System.Net.NetworkCredential(username, password);
    client.UseDefaultCredentials = true;
    client.DeliveryMethod = SmtpDeliveryMethod.Network;
    client.EnableSsl = true;

    MailMessage email = new MailMessage(from, to, subject, body);

    email.Attachments.Add(new Attachment(GlobalVariables.attachedFilePath));
    email.Attachments.Add(new Attachment(GlobalVariables.formsAndTemplatesPath[0]));
    email.Attachments.Add(new Attachment(GlobalVariables.formsAndTemplatesPath[1]));
    email.Attachments.Add(new Attachment(GlobalVariables.formsAndTemplatesPath[2]));

    client.Send(email);

System.Net.Mail.SmtpException {"Failure Sending Email."}

System.Net.Mail.SmtpException {"Failure Sending Email."}

c#

wpf

system.net.mail