c# - 通过 SMTP 服务器以编程方式发送电子邮件

Question

尝试通过 SMTP 服务器发送电子邮件，但我在 smtp.Send(mail); 代码片段中遇到无法描述的错误。

服务器端，中继 IP 地址看起来是正确的。为我所缺少的东西挠头。

MailMessage mail = new MailMessage();
mail.To.Add(txtEmail.Text);

mail.From = new MailAddress("no-reply@company.us");
mail.Subject = "Thank you for your submission...";
mail.Body = "This is where the body text goes";
mail.IsBodyHtml = false;

SmtpClient smtp = new SmtpClient();
smtp.Host = "mailex.company.us";
smtp.Credentials = new System.Net.NetworkCredential
     ("AdminName", "************");

smtp.EnableSsl = false;


if (fileuploadResume.HasFile)
{
    mail.Attachments.Add(new Attachment(fileuploadResume.PostedFile.InputStream,
        fileuploadResume.FileName));
}

smtp.Send(mail);

Answer 1

尝试在发送之前添加 smtp.DeliveryMethod = SmtpDeliveryMethod.Network;。

作为引用，这是我的标准邮件功能:

public void sendMail(MailMessage msg)
{
    string username = "username";  //email address or domain user for exchange authentication
    string password = "password";  //password
    SmtpClient mClient = new SmtpClient();
    mClient.Host = "mailex.company.us";
    mClient.Credentials = new NetworkCredential(username, password);
    mClient.DeliveryMethod = SmtpDeliveryMethod.Network;
    mClient.Timeout = 100000;
    mClient.Send(msg);
}

通常这样称呼:

MailMessage msg = new MailMessage();
msg.From = new MailAddress("fromAddr");
msg.To.Add(anAddr);

if (File.Exists(fullExportPath))
{
    Attachment mailAttachment = new Attachment(fullExportPath); //attach
    msg.Attachments.Add(mailAttachment);
    msg.Subject = "Subj";
    msg.IsBodyHtml = true;
    msg.BodyEncoding = Encoding.ASCII;
    msg.Body = "Body";
    sendMail(msg);
}
else
{
    //handle missing attachments
}