/ Private Variables /
var $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,$this->strip_comment($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");
}
return $sent;
}

/ Private Functions /
function smtp_send($helo,$to,$body = "")
{
if (!$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 $this->smtp_error("sending . [EOM]");
}
if (!$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,$this->time_out);
if (!($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);
$address = preg_replace("/^.<(.+)>.$/",$address);
return $address;
}

function smtp_debug($message)
{
if ($this->debug)
{
echo $message;
}
}

}
?>

//你的邮箱账号(去掉@163.com)
$smtpuser = "xxx";//你的163邮箱去掉后面的163.com
//你的邮箱密码
$smtppass = "xxx"; //你的163邮箱SMTP的授权码，千万不要填密码！！！

//邮件主题
$mailsubject = "测试邮件发送";
//邮件内容
$mailbody = "PHP+MySQL";
//邮件格式（HTML/TXT）,TXT为文本邮件
$mailtype = "TXT";
//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.
$smtp = new smtp($smtpserver,$smtpserverport,true,$smtpuser,$smtppass);
//是否显示发送的调试信息
$smtp->debug = TRUE;
//发送邮件
$smtp->sendmail($smtpemailto,$smtpusermail,$mailsubject,$mailbody,$mailtype);

?>