Question

我通过外部SMTP服务器发送电子邮件。使用以下代码处理发送电子邮件：

try
    {
        System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
        mail.From = new MailAddress(froma);
        mail.To.Add(toc);
        mail.Subject = subject;
        mail.IsBodyHtml = true;
        mail.Body = body;
        SmtpClient smtp = new SmtpClient(ClientServer);
        DataSet ds = new DataSet();
        int retCode = Email.getSmtp(ref ds, DatabaseName);
        string User="";
        string Password="";

        if (ds.Tables["Value"].Rows.Count > 0)
        {
            User = ds.Tables["Value"].Rows[0]["UserName"].ToString();
            Password = ds.Tables["Value"].Rows[0]["PasswordName"].ToString();
        }
        else
        {
            MessageBox.Show("Invalid SMTP settings!");
            return;
        }

        smtp.UseDefaultCredentials = false;
        smtp.Credentials = new System.Net.NetworkCredential(User, Password);
        smtp.EnableSsl = false;
        smtp.Send(mail);
    }
    catch (System.Web.HttpException exHttp)
    {
        System.Console.WriteLine("Exception occurred:" + exHttp.Message);
    }

在我的服务器上测试此代码，在同一网络上使用我自己的SMTP服务器，这将返回我的所有电子邮件。但是，使用外部SMTP服务器会导致错误：

Mailbox unavailable. The server response was: relay not permitted.

我已经阅读过，看来SMTP的管理员必须允许我服务器的中继。但是，使用提供的身份验证凭据，我似乎无法连接，并且仍然收到中继错误。

Answer 1

是的，听起来您正在使用的外部服务器不允许中继。即使您拥有正确的身份验证凭据，也无法发送电子邮件，因为仍然禁用了中继功能。你是这个外部服务器的管理员吗？如果您是，那么您可以启用它。这个LINK HERE解释了如何设置SMTP和中继。如果您不是此外部服务器的管理员，那么您必须联系谁，以便他们可以为您启用SMTP和中继。

听起来网络上的服务器已经安装了SMTP，并且因为您可以发送，所以继电器设置正确。我必须在这里安装SMTP并在所有三个服务器上配置中继（开发框，登台框和生产框）以发送电子邮件。我希望这个信息帮助。

Answer 2

我有同样的错误并注释掉了：

public class DemoActivity extends Activity {
Button play;
MediaPlayer mp;

public int playstop = 0;

private Button extisaw;
public void onCreate(Bundle ww) {
    super.onCreate(ww);
    setContentView(R.layout.activity_main);
    play = (Button) findViewById(R.id.saw);
    mp = MediaPlayer.create(this, R.raw.raj);
    show1();
    show2();
    play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (playstop == 0) {
                    MediaHandler(mp, 1);
                    mp.start();
                    playstop = 1;

                } else {
                    MediaHandler(mp, 2);
                    mp.pause();
                    playstop = 0;
                }
            }
        });
}

private void show2()
{
    // TODO: Implement this method

    this.extisaw =
        (Button)this.findViewById
    (R.id.about);
    this.extisaw.setOnClickListener
    (new OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
    });}

public void MediaHandler
(MediaPlayer mp, int e) {
    if (e == 1) {
        mp.start();
    } else {
        mp.pause();
    }
}

public void show1() {
    ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
    ImagePagerAdapter adapter = new ImagePagerAdapter();
    viewPager.setAdapter(adapter);
}

private class ImagePagerAdapter extends PagerAdapter {
    private int[] mImages = new int[]{
        R.drawable.a1, R.drawable.a2,
        R.drawable.a3, R.drawable.a4,
        R.drawable.a5, R.drawable.a6,
        R.drawable.a7, R.drawable.a8
        , R.drawable.a9, R.drawable.a10, R.drawable.a11, R.drawable.a12
        , R.drawable.a13, R.drawable.a14, R.drawable.a15
        , R.drawable.a16, R.drawable.a17, R.drawable.a18, R.drawable.a19
        , R.drawable.a20, R.drawable.a21, R.drawable.a22, R.drawable.a23
        ,
        R.drawable.a24, R.drawable.a25,
        R.drawable.a26, R.drawable.a27
        , R.drawable.a29,
        R.drawable.a30, R.drawable.a31
        , R.drawable.a32, R.drawable.a33, R.drawable.a34, R.drawable.a35
        , R.drawable.a36, R.drawable.a37, R.drawable.a38
        , R.drawable.a39, R.drawable.a40, R.drawable.a42
        , R.drawable.a43, R.drawable.a44, R.drawable.a45, R.drawable.a46,
        R.drawable.a47, R.drawable.a48,
        R.drawable.a49
        , R.drawable.a51,
        R.drawable.a52, R.drawable.a53
        , R.drawable.a54, R.drawable.a55, R.drawable.a56
        , R.drawable.a58, R.drawable.a59, R.drawable.a60
        , R.drawable.a61, R.drawable.a62, R.drawable.a63
        , R.drawable.a64, R.drawable.a65, R.drawable.a66, R.drawable.a67, R.drawable.a68, R.drawable.a69


        , R.drawable.a70,
        R.drawable.a71, R.drawable.a72
        , R.drawable.a73, R.drawable.a74, R.drawable.a75
        , R.drawable.a76, R.drawable.a77, R.drawable.a78
        , R.drawable.a79, R.drawable.a80, R.drawable.a81
        , R.drawable.a82, R.drawable.a83, R.drawable.a84, R.drawable.a85, R.drawable.a86, R.drawable.a87

        , R.drawable.a88,
        R.drawable.a89, R.drawable.a90
        , R.drawable.a91, R.drawable.a93
        , R.drawable.a94, R.drawable.a95, R.drawable.a96
        , R.drawable.a97, R.drawable.a98, R.drawable.a99

    };

    @Override
    public int getCount() {
        return mImages.length;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == ((ImageView) object);
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        Context context = DemoActivity.this;
        ImageView imageView = new ImageView(context);
        int padding = context.getResources().getDimensionPixelSize(
            R.dimen.padding_medium);
        imageView.setPadding(padding, padding, padding, padding);
        imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
        imageView.setImageResource(mImages[position]);
        ((ViewPager) container).addView(imageView, 0);
        return imageView;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        ((ViewPager) container).removeView((ImageView) object);
    }
}

电子邮件已成功发送。

信箱不可用。服务器响应是：不允许中继

2 个答案: