想了很久觉得应该写点什么，最后还是决定写个简单的邮件系统，网上有很多这样的例子，但是直接拿来后是用不了的，不得不自己动手做一个。

1、首先是写邮件的php处理文件 mail.inc.php:

<?php
//邮件
class smtp
{/* Public Variables */var $smtp_port;var $time_out;var $host_name;var $log_file;var $relay_host;var $debug;var $auth;var $user;var $pass;var $from;var $test="test";/* Private Variables */ var $sock;/* Constractor */function smtp($relay_host = "", $smtp_port = 25,$auth = false,$user,$pass,$from){$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->from = $from;#$this->host_name = "localhost"; //is used in HELO command $this->log_file = "";$this->sock = FALSE;}/* Main Function */function sendmail($to,$fromname="",$subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = ""){$mail_from = $this->get_address($this->strip_comment($this->from));$body = ereg_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: ".$cc."\r\n";}if ($fromname!="") $header .= "From: ".$fromname."<".$this->from.">\r\n";if ($fromname=="") $header .= "From:<".$this->from.">\r\n";$header .= "Subject: ".$subject."\r\n";$header .= $additional_headers;$header .= "Date: ".date("r")."\r\n";$header .= "X-Mailer:By Redhat (PHP/".phpversion().")\r\n";$utfheader=iconv("GBK","UTF-8//IGNORE",$header);list($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, $utfheader, $body)) {$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, $from, $to, $header, $body = ""){if (!$this->smtp_putcmd("HELO", $helo)) {return $this->smtp_error("sending HELO command");}#authif($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 (!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 (ereg($comment, $address)) {$address = ereg_replace($comment, "", $address);}return $address;}function get_address($address){$address = ereg_replace("([ \t\r\n])+", "", $address);$address = ereg_replace("^.*<(.+)>.*$", "\1", $address);return $address;}function smtp_debug($message){if ($this->debug) {echo $message;}}
}
?>

2、编写邮件的参数配置 mail.php:

<?php
include_once("mail.inc.php");
//发件人信箱信息
$smtp = new smtp("smtp.xxxxx.com,25,true,"服务器用户账号","服务器用户密码", "服务器用户邮箱");
//是否显示发送的调试信息 FALSE or TRUE
$smtp->debug = false;$mailto = "xxxx@xx.com";//收件人信箱$mailsubject = "邮箱标题";$mailfrom = $_POST["email"];$mailbody = "正文: ".$_POST["email"]";$mailbody = $mailbody.正文：".$_POST["content"]."<br>";// $mailbody = $mailbody."如图:".$_POST["img"]."<br>";//其他的表单项目以此类推$mailtype = "HTML";//邮件格式（HTML/TXT）,TXT为文本邮件$mailsubject = '=?UTF-8?B?'.base64_encode($mailsubject).'?=';//邮件主题$mailfrom = '=?UTF-8?B?'.base64_encode($mailfrom).'?=';//发件人$smtp->sendmail($mailto, $mailfrom, $mailsubject, $mailbody, $mailtype);//echo "<script language=\"JavaScript\">alert(\"Send success.\");\"http://www.oceanx.cc/help/feedback.html\"</script>"; echo "<script language=\"JavaScript\">alert("发送成功");</script>"; exit();?>

3、接下来就是前端显示的表单了，这个很简单，直接使用html就行。下面是mail.html代码：

<!DOCTYPE html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"><title>简单邮件系统</title>
</head>
<body>
<form name="contactForm" method="post" action="mail.php" target="ifrm">标题：<input type="text" name="email" id="contact">内容：<textarea id="content" name="content" ></textarea><input type="submit" name="submit" value="发送">
</form>
</body>
</html>

3、接下来就是前端显示的表单了，这个很简单，直接使用html就行。下面是mail.html代码：

可以根据自己的需要定制该邮件系统，如果需要更好的html显示，那么就自己好好设计一个页面，这样就可以变为自己喜欢的样子，不过有几个要点要注意。

1、mail.php中的$_POST["replease"]中的replease为form表单中要提交的数据的name，必须要对应，不能搞错。

2、如果要上传附件，需要修改mail.inc.php中的内容，将加载附件的模块添加进去。