电子邮件发送代码在本地主机上工作但不在 IONOS 服务器上

如何解决电子邮件发送代码在本地主机上工作但不在 IONOS 服务器上

我在 ASP.NET 中有以下脚本作为我的“联系我们”页面。该脚本可在 VS (localhost) 中运行，但在部署到 IONOS 服务器后无法运行。

protected void send_Click(object sender,EventArgs e)
    {
            try
            {
                MailMessage Msg = new MailMessage();
                //Sender e-mail address.
                Msg.From = new MailAddress(txtEmail.Text);
                //Recipient e-mail address.
                Msg.To.Add("[e-mail]");



                //Meaages Subject
                Msg.Subject = "A New Email from Contact Us page";

                StringBuilder sb = new StringBuilder();
                sb.Append("Subject: " + txtSubject.Text + "\r\n");
                sb.Append("Message: " + txtBody.Text + "\r\n");

                if (FileUpload1.HasFile)
                {
                    string FileName = FileUpload1.PostedFile.FileName;
                    Msg.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream,FileName));

                }

                Msg.Body = sb.ToString();

                // SMTP server IP.
                SmtpClient smtp = new SmtpClient();
                smtp.Host = "smtp.gmail.com";
                smtp.Port = 587;

                smtp.Timeout = 10000;
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.UseDefaultCredentials = false;
                
                smtp.Credentials = new System.Net.NetworkCredential("[e-mail]","XXX-MyPassword-XXX");
                smtp.EnableSsl = true;

                Msg.DeliveryNotificationoptions = DeliveryNotificationoptions.OnFailure;
                smtp.Send(Msg);

                //Mail Message
                Response.Write("<Script>alert('Thanks for contact us,our team will be contact you as soon as possible')</Script>");

            }
            catch (Exception ex)
            {
                Response.Write("<script>alert('" + ex.Message + "');</script>");
            }
        }

        else
        {
            Label2.Visible = true;
        }
    }

解决方法

我找到了解决方案。
您只需要编辑以下脚本（您的电子邮件地址和密码）。

protected void send_Click(object sender,EventArgs e) { 尝试 { MailMessage Msg = new MailMessage(); //发件人电子邮件地址。 Msg.From = 新 邮件地址（txtEmail.Text）； //收件人电子邮件地址。 Msg.To.Add("[e-mail]");

            //Meaages Subject
            Msg.Subject = "A New Email from Contact Us page";

            StringBuilder sb = new StringBuilder();
            sb.Append("Subject: " + txtSubject.Text + "\r\n");
            sb.Append("Message: " + txtBody.Text + "\r\n");

            if (FileUpload1.HasFile)
            {
                string FileName = FileUpload1.PostedFile.FileName;
                Msg.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream,FileName));

            }

            Msg.Body = sb.ToString();
            SmtpClient smtp = new SmtpClient();
            smtp.Host = "smtp.ionos.com";
            smtp.Port = 25;
            smtp.Timeout = 10000;
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.UseDefaultCredentials = false;

            smtp.Credentials = new System.Net.NetworkCredential("[e-mail]","XXPasswordXX");
            smtp.EnableSsl = true;

            Msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
            smtp.Send(Msg);

//邮件消息 Response.Write("alert('感谢联系我们，我们的团队会尽快与您联系')");

        }
        catch (Exception ex)
        {
            Response.Write("<script>alert('" + ex.Message + "');</script>");
        }
    }

    else
    {
        Label2.Visible = true;
    }
}