Ich kann E-Mails in meiner lokalen Umgebung senden, aber nicht unter Linux

Der Code lautet

<?php

class smtp
{
 /* Public Variables */
 public $smtp_port;
 public $time_out;
 public $host_name;
 public $log_file;
 public $relay_host;
 public $debug;
 public $auth;
 public $user;
 public $pass;

 /* Private Variables */
 private $sock;

 /* Constractor */
 function smtp($relay_host = "", $smtp_port = 25, $auth = false, $user, $pass)
 {
  $this->debug = FALSE;
  $this->smtp_port = $smtp_port;
  $this->relay_host = $relay_host;
  $this->time_out = 30; //is used in fsockopen()
  #
  $this->auth = $auth;//auth
  $this->user = $user;
  $this->pass = $pass;
  #
  $this->host_name = "localhost"; //is used in HELO command
  $this->log_file = "";

  $this->sock = FALSE;
 }

 /* Main Function */
 function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "")
 {
  $mail_from = $this->get_address($this->strip_comment($from));
  $body = preg_replace("/(^|(\r\n))(\.)/", "\1.\3", $body);
  $header = "MIME-Version:1.0\r\n";
  if ($mailtype == "HTML") {
   $header .= "Content-Type:text/html\r\n";
  }
  $header .= "To: " . $to . "\r\n";
  if ($cc != "") {
   $header .= "Cc: " . $cc . "\r\n";
  }
  $header .= "From: $from<" . $from . ">\r\n";
  $header .= "Subject: " . $subject . "\r\n";
  $header .= $additional_headers;
  $header .= "Date: " . date("r") . "\r\n";
  $header .= "X-Mailer:By Redhat (PHP/" . phpversion() . ")\r\n";
  list($msec, $sec) = explode(" ", microtime());
  $header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">\r\n";
  $TO = explode(",", $this->strip_comment($to));

  if ($cc != "") {
   $TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
  }

  if ($bcc != "") {
   $TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
  }

  $sent = TRUE;
  foreach ($TO as $rcpt_to) {
   $rcpt_to = $this->get_address($rcpt_to);
   if (!$this->smtp_sockopen($rcpt_to)) {
    $this->log_write("Error: Cannot send email to " . $rcpt_to . "\n");
    $sent = FALSE;
    continue;
   }
   if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
    $this->log_write("E-mail has been sent to <" . $rcpt_to . ">\n");
   } else {
    $this->log_write("Error: Cannot send email to <" . $rcpt_to . ">\n");
    $sent = FALSE;
   }
   fclose($this->sock);
   $this->log_write("Disconnected from remote host\n");
  }
  echo "<br>";
  echo $header;
  return $sent;
 }

 /* Private Functions */

 function smtp_send($helo, $from, $to, $header, $body = "")
 {
  if (!$this->smtp_putcmd("HELO", $helo)) {
   return $this->smtp_error("sending HELO command");
  }
  #auth
  if ($this->auth) {
   if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {
    return $this->smtp_error("sending HELO command");
   }
   if (!$this->smtp_putcmd("", base64_encode($this->pass))) {
    return $this->smtp_error("sending HELO command");
   }
  }
  #
  if (!$this->smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {
   return $this->smtp_error("sending MAIL FROM command");
  }

  if (!$this->smtp_putcmd("RCPT", "TO:<" . $to . ">")) {
   return $this->smtp_error("sending RCPT TO command");
  }

  if (!$this->smtp_putcmd("DATA")) {
   return $this->smtp_error("sending DATA command");
  }

  if (!$this->smtp_message($header, $body)) {
   return $this->smtp_error("sending message");
  }

  if (!$this->smtp_eom()) {
   return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
  }

  if (!$this->smtp_putcmd("QUIT")) {
   return $this->smtp_error("sending QUIT command");
  }

  return TRUE;
 }

 function smtp_sockopen($address)
 {
  if ($this->relay_host == "") {
   return $this->smtp_sockopen_mx($address);
  } else {
   return $this->smtp_sockopen_relay();
  }
 }

 function smtp_sockopen_relay()
 {
  $this->log_write("Trying to " . $this->relay_host . ":" . $this->smtp_port . "\n");
  $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);
  if (!($this->sock && $this->smtp_ok())) {
   $this->log_write("Error: Cannot connenct to relay host " . $this->relay_host . "\n");
   $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");
   return FALSE;
  }
  $this->log_write("Connected to relay host " . $this->relay_host . "\n");
  return TRUE;
 }

 function smtp_sockopen_mx($address)
 {
  $domain = preg_replace("/^.+@([^@]+)$/", "\1", $address);
  if (!@getmxrr($domain, $MXHOSTS)) {
   $this->log_write("Error: Cannot resolve MX \"" . $domain . "\"\n");
   return FALSE;
  }
  foreach ($MXHOSTS as $host) {
   $this->log_write("Trying to " . $host . ":" . $this->smtp_port . "\n");
   $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);
   if (!($this->sock && $this->smtp_ok())) {
    $this->log_write("Warning: Cannot connect to mx host " . $host . "\n");
    $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");
    continue;
   }
   $this->log_write("Connected to mx host " . $host . "\n");
   return TRUE;
  }
  $this->log_write("Error: Cannot connect to any mx hosts (" . implode(", ", $MXHOSTS) . ")\n");
  return FALSE;
 }

 function smtp_message($header, $body)
 {
  fputs($this->sock, $header . "\r\n" . $body);
  $this->smtp_debug("> " . str_replace("\r\n", "\n" . "> ", $header . "\n> " . $body . "\n> "));

  return TRUE;
 }

 function smtp_eom()
 {
  fputs($this->sock, "\r\n.\r\n");
  $this->smtp_debug(". [EOM]\n");

  return $this->smtp_ok();
 }

 function smtp_ok()
 {
  $response = str_replace("\r\n", "", fgets($this->sock, 512));
  $this->smtp_debug($response . "\n");

  if (!preg_match("/^[23]/", $response)) {
   fputs($this->sock, "QUIT\r\n");
   fgets($this->sock, 512);
   $this->log_write("Error: Remote host returned \"" . $response . "\"\n");
   return FALSE;
  }
  return TRUE;
 }

 function smtp_putcmd($cmd, $arg = "")
 {
  if ($arg != "") {
   if ($cmd == "") $cmd = $arg;
   else $cmd = $cmd . " " . $arg;
  }

  fputs($this->sock, $cmd . "\r\n");
  $this->smtp_debug("> " . $cmd . "\n");

  return $this->smtp_ok();
 }

 function smtp_error($string)
 {
  $this->log_write("Error: Error occurred while " . $string . ".\n");
  return FALSE;
 }

 function log_write($message)
 {
  $this->smtp_debug($message);

  if ($this->log_file == "") {
   return TRUE;
  }

  $message = date("M d H:i:s ") . get_current_user() . "[" . getmypid() . "]: " . $message;
  if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {
   $this->smtp_debug("Warning: Cannot open log file \"" . $this->log_file . "\"\n");
   return FALSE;
  }
  flock($fp, LOCK_EX);
  fputs($fp, $message);
  fclose($fp);

  return TRUE;
 }

 function strip_comment($address)
 {
  $comment = "/\([^()]*\)/";
  while (preg_match($comment, $address)) {
   $address = preg_replace($comment, "", $address);
  }

  return $address;
 }

 function get_address($address)
 {
  $address = preg_replace("/([ \t\r\n])+/", "", $address);
  $address = preg_replace("/^.*<(.+)>.*$/", "\1", $address);

  return $address;
 }

 function smtp_debug($message)
 {
  if ($this->debug) {
   echo $message . "<br>";
  }
 }

 function get_attach_type($image_tag)
 { //

  $filedata = array();

  $img_file_con = fopen($image_tag, "r");
  unset($image_data);
  while ($tem_buffer = AddSlashes(fread($img_file_con, filesize($image_tag))))
   $image_data = $tem_buffer;
  fclose($img_file_con);

  $filedata['context'] = $image_data;
  $filedata['filename'] = basename($image_tag);
  $extension = substr($image_tag, strrpos($image_tag, "."), strlen($image_tag) - strrpos($image_tag, "."));
  switch ($extension) {
   case ".gif":
    $filedata['type'] = "image/gif";
    break;
   case ".gz":
    $filedata['type'] = "application/x-gzip";
    break;
   case ".htm":
    $filedata['type'] = "text/html";
    break;
   case ".html":
    $filedata['type'] = "text/html";
    break;
   case ".jpg":
    $filedata['type'] = "image/jpeg";
    break;
   case ".tar":
    $filedata['type'] = "application/x-tar";
    break;
   case ".txt":
    $filedata['type'] = "text/plain";
    break;
   case ".zip":
    $filedata['type'] = "application/zip";
    break;
   default:
    $filedata['type'] = "application/octet-stream";
    break;
  }
  return $filedata;
 }

} // end cla

$smtpserver = "smtp.163.com";//SMTP服务器
$smtpserverport = 25;//SMTP服务器端口
$smtpusermail = "xxx163.com";//SMTP服务器的用户邮箱
$smtpemailto = "xxx@qq.com";//发送给谁
$smtpuser = "xxx@163.com";//SMTP服务器的用户帐号
$smtppass = "xxx";//SMTP服务器的用户密码
$mailsubject = "PHP测试邮件系统";//邮件主题
$mailbody = "<h1> 这是一个测试程序</h1>";//邮件内容
$mailtype = "HTML";//邮件格式（HTML/TXT）,TXT为文本邮件
##########################################
$smtp = new smtp($smtpserver, $smtpserverport, true, $smtpuser, $smtppass);//这里面的一个true是表示使用身份验证,否则不使用身份验证.
$smtp->debug = true;//是否显示发送的调试信息
$smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype);

Die Fehlermeldung lautet
Fehler: Verbindung zum Relay-Host smtp.163.com kann nicht hergestellt werden

Überprüfen Sie, was im Internet steht: a. Suchen Sie nach PHP.ini und überprüfen Sie zwei Stellen, die auf „on“ gesetzt sein sollten. Wenn fsock und fsockopen später angezeigt werden, müssen Sie diese beiden ändern Entfernen Sie diese Funktion, starten Sie Apache neu und Sie können dann normal E-Mails senden.
Es ist alles normal.