从webhosting发送电子邮件,而无需使用用户名和密码

我写了一个C#程序来发送一封完美的电子邮件.另外,我有一个PHP脚本来发送电子邮件,它也很好用.

但我的问题是:是否可以像使用PHP一样发送带有C#的电子邮件,而不需要指定凭据,服务器,端口等.

我想使用C#而不是PHP,因为我正在创建一个ASP.Net Web应用程序.

这是我目前的C#代码:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using System.Net.Mail;
using System.Net;

namespace $rootnamespace$
{
public partial class $safeitemname$ : Form
{
    public $safeitemname$()
    {
        InitializeComponent();
    }

    private void AttachB_Click(object sender, EventArgs e)
    {
        if (AttachDia.ShowDialog() == DialogResult.OK)
        {
            string AttachF1 = AttachDia.FileName.ToString();
            AttachTB.Text = AttachF1;
            AttachPB.Visible = true;
            AttachIIB.Visible = true;
            AttachB.Visible = false;
        }
    }

    private void AttachIIB_Click(object sender, EventArgs e)
    {
        if (AttachDia.ShowDialog() == DialogResult.OK)
        {
            string AttachF1 = AttachDia.FileName.ToString();
            AttachIITB.Text = AttachF1;
            AttachPB.Visible = true;

        }
    }





    private void SendB_Click(object sender, EventArgs e)
    {
        try
        {
            SmtpClient client = new SmtpClient(EmailSmtpAdresTB.Text);
            client.EnableSsl = true;
            client.Timeout = 20000;
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.UseDefaultCredentials = false;
            client.Credentials = new NetworkCredential(EmailUserNameTB.Text, EmailUserPasswordTB.Text);
            MailMessage Msg = new MailMessage();
            Msg.To.Add(SendToTB.Text);
            Msg.From = new MailAddress(SendFromTB.Text);
            Msg.Subject = SubjectTB.Text;
            Msg.Body = EmailTB.Text;

            /// Add Attachments to mail or Not
            if (AttachTB.Text == "")
            {
                if (EmailSmtpPortTB.Text != null)
                    client.Port = System.Convert.ToInt32(EmailSmtpPortTB.Text);

                client.Send(Msg);
                MessageBox.Show("Successfuly Send Message !");
            }
            else 
            {
                Msg.Attachments.Add(new Attachment(AttachTB.Text));
                Msg.Attachments.Add(new Attachment(AttachIITB.Text));
                if (EmailSmtpPortTB.Text != null)
                client.Port = System.Convert.ToInt32(EmailSmtpPortTB.Text);

                client.Send(Msg);
                MessageBox.Show("Successfuly Send Message !");
            }


        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    private void settingsBindingNavigatorSaveItem_Click(object sender, EventArgs e)
    {
        this.Validate();
        this.settingsBindingSource.EndEdit();
        this.tableAdapterManager.UpdateAll(this.awDushiHomesDBDataSet);

    }

    private void awDushiHomesEmail_Load(object sender, EventArgs e)
    {
        // TODO: This line of code loads data into the 'awDushiHomesDBDataSet.Settings' table. You can move, or remove it, as needed.
        this.settingsTableAdapter.Fill(this.awDushiHomesDBDataSet.Settings);

    }
  }
}

这是在PHP中完成的:

--PHP-mixed- 
Content-Type: multipart/alternative; boundary="PHP-alt-"

--PHP-alt- 
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

Hello World!!!
This is simple text email message.

--PHP-alt- 
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

Hello World!
This is something with HTML formatting.

--PHP-alt---

--PHP-mixed- 
Content-Type: application/zip; name="Doc1.pdf" 
Content-Transfer-Encoding: base64 
Content-Disposition: attachment 


--PHP-mixed---

 

我不是要求你写我的代码,但也许你可以提供一些信息或让我知道它是否可能.

编辑:

我的问题不是不使用smtp服务器,而是如何发送电子邮件而无需输入用户名和密码.我知道,只有发送电子邮件的请求来自我的服务器才会有效.

在PHP中你可以发送邮件而不指定SMTP凭据的原因是因为其他人已经为你配置了php.ini或sendmail.ini(php解释器用来获取某些值的文件).

这通常是托管主机的情况(或者如果您使用像AMPPS这样的工具在您的开发者电脑上使用php,它可以让您通过UI轻松编辑SMTP设置并忘记它).

在ASP.net/c#中有app.config或web.config文件,您可以在其中注入smtp设置(在标记中),因此可以获得与PHP相同的结果(SmtpClient将自动使用存储在那里的凭据).

请参阅以下问题以获取示例:

SmtpClient和app.config system.net配置

使用配置文件的MailSettings进行SMTP身份验证