Question

我有一些代码无法成功执行，我无法理解原因。

此功能：

public void send(Envelope envelope) throws IOException
{
        String CRLF = "\r\n";
    sendCommand("MAIL FROM:"+ envelope.Sender + CRLF, 250);

    //error occuring here. "Return Code:500 #5.5.1 command not recognized"
    sendCommand("RCPT TO:" + envelope.Recipient + CRLF, 250);
    sendCommand("DATA", 354);
    toServer.print(envelope.Message.Headers + CRLF);
    toServer.print(envelope.Message.Body + CRLF);
    toServer.print("." +CRLF);
}

上面的代码调用了这个函数：

private void sendCommand(String command, int rc) throws IOException
{
    /* Write command to server */
    toServer.print(command + CRLF);

    /*read reply from server. */
    String line = fromServer.readLine();

    System.err.println("Request: " + command);
    System.err.println("Return Code:" + line);


    /*
     * Check that the server's reply code is the same as the parameter rc.
     * If not, throw an IOException.
     */
    if (!line.substring(0,3).equals(rc+""))
    {
        throw new IOException();
    }
}

因此传播信息：

Socket connection = new Socket(envelope.DestAddr, SMTP_PORT); 
    fromServer = new BufferedReader(new InputStreamReader(connection.getInputStream()));
    toServer = new PrintStream(connection.getOutputStream());

我使用相同的From和To john.holland@covenant.edu。由于某种原因，RCPT TO：命令遇到错误说：

＆＃34;返回代码：500＃5.5.1命令无法识别＆＃34;

编辑：我确实通过远程登录手动尝试了

Answer 1

您正在追加\r\n两次 - 在send()生成字符串时一次，在sendCommand()调用中print()一次。

第二个\r\n会触发500 5.5.1 Unrecognized command.

RCPT TO：<rcpt @ host> SMTP语法</rcpt @ host>

1 个答案: