利用php mail 发送邮件代码

class email
{
 function email()
 {
  $this->__construct();
 }

 function __construct()
    {
  @define('charset','gbk');
  $this->set(mail_server, mail_port, mail_user, mail_pwd,mail_type);
  $this->auth = 1;
 }

 function set($server, $port, $user, $password, $type = 1, $delimiter = 1, $mailusername = 0)
 {
  $this->type = $type;
  $this->server = $server;
  $this->port = $port;
  $this->user = $user;
  $this->password = $password;
        $this->delimiter = $delimiter == 1 ? "rn" : ($delimiter == 2 ? "r" : "n");
  $this->mailusername = $mailusername;
 }
 
 function send($email_to, $email_subject, $email_message, $email_from = '')
 {
  global $dircms;
  $email_to=iconv("utf-8", "gbk", $email_to);
  $email_subject=iconv("utf-8", "gbk", $email_subject);
  $email_message=iconv("utf-8", "gbk", $email_message);
  $email_subject = '=?'.charset.'?b?'.base64_encode(str_replace("r", '', $email_subject)).'?=';
  $email_message = str_replace("rn.", " rn..", str_replace("n", "rn", str_replace("r", "n", str_replace("rn", "n", str_replace("nr", "r", $email_message)))));
  $adminemail = $this->type == 1 ? $dircms['mail_user'] : $dircms['mail_user'];
  $email_from = $email_from == '' ? '=?'.charset.'?b?'.base64_encode($dircms['site_name'])."?= <$adminemail>" : (preg_match('/^(.+?) <(.+?)>$/',$email_from, $from) ? '=?'.charset.'?b?'.base64_encode($from[1])."?= <$from[2]>" : $email_from);
  $emails = explode(',', $email_to);
  foreach($emails as $touser)
  {
   $tousers[] = preg_match('/^(.+?) <(.+?)>$/',$touser, $to) ? ($this->mailusername ? '=?'.charset.'?b?'.base64_encode($to[1])."?= <$to[2]>" : $to[2]) : $touser;
  }
  $email_to = implode(',', $tousers);
  $headers = "from: $email_from{$this->delimiter}x-priority: 3{$this->delimiter}x-mailer: dircms {$this->delimiter}mime-version: 1.0{$this->delimiter}content-type: text/html; charset=".charset."{$this->delimiter}";
  if($this->type == 1)
  {
   return $this->smtp($email_to, $email_subject, $email_message, $email_from, $headers);
  }
  elseif($this->type == 2)
  {
   return @mail($email_to, $email_subject, $email_message, $headers);
  }
  else
  {
   ini_set('smtp', $this->server);
   ini_set('smtp_port', $this->port);
   ini_set('sendmail_from', $email_from);
   return @mail($email_to, $email_subject, $email_message, $headers);
  }
 }

 function smtp($email_to, $email_subject, $email_message, $email_from = '', $headers = '')
 {
  global $dircms;
  if(!$fp = fsockopen($this->server, $this->port, $errno, $errstr, 10))
  {
   $this->errorlog('smtp', "($this->server:$this->port) connect - unable to connect to the smtp server", 0);
   return false;
  }
  stream_set_blocking($fp, true);
  $lastmessage = fgets($fp, 512);
  if(substr($lastmessage, 0, 3) != '220')
  {
   $this->errorlog('smtp', "$this->server:$this->port connect - $lastmessage", 0);
   return false;
  }
  fputs($fp, "ehlo dircmsrn");
  $lastmessage = fgets($fp, 512);
  if(substr($lastmessage, 0, 3) != 220 && substr($lastmessage, 0, 3) != 250)
  {
   $this->errorlog('smtp', "($this->server:$this->port) helo/ehlo - $lastmessage", 0);
   return false;
  }
  while(1)
  {
   if(substr($lastmessage, 3, 1) != '-' || empty($lastmessage))
   {
    break;
   }
   $lastmessage = fgets($fp, 512);
  }
  fputs($fp, "auth loginrn");
  $lastmessage = fgets($fp, 512);
  if(substr($lastmessage, 0, 3) != 334)
  {
   $this->errorlog('smtp', "($this->server:$this->port) auth login - $lastmessage", 0);
   return false;
  }
  fputs($fp, base64_encode($this->user)."rn");
  $lastmessage = fgets($fp, 512);
  if(substr($lastmessage, 0, 3) != 334)
  {
   $this->errorlog('smtp', "($this->server:$this->port) username - $lastmessage", 0);
   return false;
  }
  fputs($fp, base64_encode($this->password)."rn");
  $lastmessage = fgets($fp, 512);
  if(substr($lastmessage, 0, 3) != 235)
  {
   $this->errorlog('smtp', "($this->server:$this->port) password - $lastmessage", 0);
   return false;
  }
  fputs($fp, "mail from: <".preg_replace("/.*<(.+?)>.*/", "
", $email_from).">rn");
  $lastmessage = fgets($fp, 512);
  if(substr($lastmessage, 0, 3) != 250)
  {
   fputs($fp, "mail from: <".preg_replace("/.*<(.+?)>.*/", "
", $email_from).">rn");
   $lastmessage = fgets($fp, 512);
   if(substr($lastmessage, 0, 3) != 250)
   {
    $this->errorlog('smtp', "($this->server:$this->port) mail from - $lastmessage", 0);
    return false;
   }
  }
  $email_tos = array();
  $emails = explode(',', $email_to);
  foreach($emails as $touser)
  {
   $touser = trim($touser);
   if($touser)
   {
    fputs($fp, "rcpt to: <".preg_replace("/.*<(.+?)>.*/", "
", $touser).">rn");
    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != 250)
    {
     fputs($fp, "rcpt to: <".preg_replace("/.*<(.+?)>.*/", "
", $touser).">rn");
     $lastmessage = fgets($fp, 512);
     $this->errorlog('smtp', "($this->server:$this->port) rcpt to - $lastmessage", 0);
     return false;
    }
   }
  }
  fputs($fp, "datarn");
  $lastmessage = fgets($fp, 512);
  if(substr($lastmessage, 0, 3) != 354)
  {
   $this->errorlog('smtp', "($this->server:$this->port) data - $lastmessage", 0);
  }
  $headers .= 'message-id: <'.gmdate('ymdhs').'.'.substr(md5($email_message.microtime()), 0, 6).rand(100000, 999999).'@'.$_server['http_host'].">{$this->delimiter}";
  fputs($fp, "date: ".gmdate('r')."rn");
  fputs($fp, "to: ".$email_to."rn");
  fputs($fp, "subject: ".$email_subject."rn");
  fputs($fp, $headers."rn");
  fputs($fp, "rnrn");
  fputs($fp, "$email_messagern.rn");
  fputs($fp, "quitrn");
  return true;
 }

 function errorlog($type, $message, $is)
 {
  $this->error[] = array($type, $message, $is);
 }
}