PHP使用SMTP发送邮件报错Cannot connenct to relay host

首先使用以下代码测试
email.class.php定义发送邮件的库

<?php
class smtp
{
  /* Public Variables */
  var $smtp_port; //smtp_port 端口号
  var $time_out;
  var $host_name; //服务器主机名
  var $log_file;
  var $relay_host; //服务器主机地址
  var $debug;
  var $auth; //验证
  var $user; //服务器用户名
  var $pass; //服务器密码
  /* Private Variables */
  var $sock;
  /* Constractor 构造方法*/
  function smtp($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->host_name = "smtp.163.com"; //is used in HELO command
    $this->log_file  = "";
    $this->sock = FALSE;
  }
  /* Main Function */
  function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "")
  {
    $header  = "";
    $mail_from = $this->get_address($this->strip_comment($from));
    $body   = mb_ereg_replace("(^|(\r\n))(\\.)", "\\1.\\3", $body);
    $header .= "MIME-Version:1.0\r\n";
    if ($mailtype == "HTML") { //邮件发送类型
      //$header .= "Content-Type:text/html\r\n";
      $header .= 'Content-type: text/html; charset=utf-8' . "\r\n";
    }
    $header .= "To: " . $to . "\r\n";
    if ($cc != "") {
      $header .= "Cc: " . $cc . "\r\n";
    }
    $header .= "From: " . $from . "\r\n";
    // $header .= "From: $from<".$from.">\r\n";  //这里只显示邮箱地址,不够人性化
    $header .= "Subject: " . $subject . "\r\n";
    $header .= $additional_headers;
    $header .= "Date: " . date("r") . "\r\n";
    $header .= "X-Mailer:By (PHP/" . phpversion() . ")\r\n";
    list($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))); //合并一个或多个数组
    }
    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)
  {
    $domain = ereg_replace("^.+@([^@]+)$", "\\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 (!mb_ereg("^[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)
  {
    $comment = "\\([^()]*\\)";
    while (mb_ereg($comment, $address)) {
      $address = mb_ereg_replace($comment, "", $address);
    }
    return $address;
  }
  function get_address($address)
  {
    $address = mb_ereg_replace("([ \t\r\n])+", "", $address);
    $address = mb_ereg_replace("^.*<(.+)>.*$", "\\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;
  }
}
?>

index.php发送邮件的具体实现

<?php
header('Content-type: text/html; charset=UTF8'); //解决echo返回信息乱码
require 'email.class.php';
$mailto='*********@qq.com'; //收件人
$subject="恭喜您开通年费会员成功"; //邮件主题
$body="回复TD退订"; //邮件内容
sendmailto($mailto,$subject,$body);
echo "测试".date('时间:Y年m月d日  H:i');
function sendmailto($mailto, $mailsub, $mailbd)
{
  //require_once ('email.class.php');
  //##########################################
  $smtpserver   = "smtp.163.com"; //SMTP服务器
  $smtpserverport = 25; //SMTP服务器端口
  $smtpusermail  = "***********@163.com"; //SMTP服务器的用户邮箱
  $smtpemailto  = $mailto;
  $smtpuser    = "*******@163.com"; //SMTP服务器的用户帐号
  $smtppass    = "**********"; //SMTP服务器的用户密码
  $mailsubject  = $mailsub; //邮件主题
  $mailsubject  = "=?UTF-8?B?" . base64_encode($mailsubject) . "?="; //防止乱码
  $mailbody    = $mailbd; //邮件内容
  //$mailbody = "=?UTF-8?B?".base64_encode($mailbody)."?="; //防止乱码
  $mailtype    = "HTML"; //邮件格式(HTML/TXT),TXT为文本邮件. 139邮箱的短信提醒要设置为HTML才正常
  ##########################################
  $smtp      = new smtp($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);
}
?>

上传以上代码到网站根目录,访问提示错误如下:
调试信息.jpg
经过不懈的努力最终发现问题出在服务器的环境配置上,如下图。
PHP参数.jpg
使用下面的代码检查PHP配置信息

<?php
    phpinfo();
?>

找到php.ini,查看两个地方,一个是allow_url_fopen,这个地方要设置成on;另一个地方是查看disable_functions,如果后面出现了fsock,fsockopen,则需要把这两个函数去掉,重启PHP,然后就可以正常发送邮件了。
如果你使用了AppNode可能发现PHP全局设置和各网站的PHP设置不一致,这时候需要在网站管理- 设置-PHP-PHP安全菜单中单独修改各网站的PHP设置,如下图所示:
网站设置.jpg

最后希望你出现与本文一定的问题时,能第一时间看到这篇文章让你少走弯路,如果这篇文章对你也有所帮助的话请留言鼓励一下博主呗。

Last modification:August 17th, 2019 at 10:21 am
如果觉得我的文章对你有用,请随意赞赏

7 comments

  1. 伯正博客

    我就只有一个恢复评论邮件通知的功能,其他的不懂。

    1. 拾玖
      @伯正博客

      呃,我有一个网站部署到AppNode上的,发现邮件发不出来,最后才发现AppNode的PHP安全设置较高,不允许程序访问网络,简单设置一下就行,如果你不是用的AppNode,出现问题也可以关注一下这两个参数,毕竟是一个故障排查的方向。

  2. 沉默是金

    PHP大佬,带带我可好

  3. repostone

    非技术的路过。

  4. 森纯博客

    不错,收藏

  5. gaigai

    →_→收藏

    1. 拾玖
      @gaigai

      ヾ(≧∇≦*)ゝ好的呢,我也是发现这个坑在AppNode面板中存在比较多。

Leave a Comment