如何在PHP网页中发送邮件

先建一个邮件发送的类 sendEmail.class.php页面：

class smail {
//您的SMTP 服务器供应商，可以是域名或IP地址
var $smtp = "";
//SMTP需要要身份验证设值为 1 不需要身份验证值为 0，现在大多数的SMTP服务商都要验证，如不清楚请与你的smtp 服务商联系。
var $check = 1;
//您的email帐号名称
var $username = "";
//您的email密码
var $password = "";
//此email 必需是发信服务器上的email
var $s_from = "";

function smail ( $from, $password, $smtp, $check = 1 ) {
if( preg_match("/^[^\d\-_][\w\-]*[^\-_]@[^\-][a-zA-Z\d\-]+[^\-](\.[^\-][a-zA-Z\d\-]*[^\-])*\.[a-zA-Z]{2,3}/", $from ) ) {
$this->username = substr( $from, 0, strpos( $from , "@" ) );
$this->password = $password;
$this->smtp = $smtp ? $smtp : $this->smtp;
$this->check = $check;
$this->s_from = $from;
}
}

function send ( $to, $from, $subject, $message ) {

//连接服务器
$fp = fsockopen ( $this->smtp, 25, $errno, $errstr, 60);
if (!$fp ) return "联接服务器失败".__LINE__;
set_socket_blocking($fp, true );

$lastmessage=fgets($fp,512);
if ( substr($lastmessage,0,3) != 220 ) return "错误信息1:$lastmessage".__LINE__;

//HELO
$yourname = "YOURNAME";
if($this->check == "1") $lastact="EHLO ".$yourname."
";
else $lastact="HELO ".$yourname."
";

fputs($fp, $lastact);
$lastmessage == fgets($fp,512);
if (substr($lastmessage,0,3) != 220 ) return "错误信息2:$lastmessage".__LINE__;
while (true) {
$lastmessage = fgets($fp,512);
if ( (substr($lastmessage,3,1) != "-") or (empty($lastmessage)) )
break;
}

//身份验证
if ($this->check=="1") {
//验证开始
$lastact="AUTH LOGIN"."
";
fputs( $fp, $lastact);
$lastmessage = fgets ($fp,512);
if (substr($lastmessage,0,3) != 334) return "错误信息3:$lastmessage".__LINE__;
//用户姓名
$lastact=base64_encode($this->username)."
";
fputs( $fp, $lastact);
$lastmessage = fgets ($fp,512);
if (substr($lastmessage,0,3) != 334) return "错误信息4:$lastmessage".__LINE__;
//用户密码
$lastact=base64_encode($this->password)."
";
fputs( $fp, $lastact);
$lastmessage = fgets ($fp,512);
if (substr($lastmessage,0,3) != "235") return "错误信息5:$lastmessage".__LINE__;
}

//FROM:
$lastact="MAIL FROM: <". $this->s_from . ">
";
fputs( $fp, $lastact);
$lastmessage = fgets ($fp,512);
if (substr($lastmessage,0,3) != 250) return "错误信息6:$lastmessage".__LINE__;

//TO:
$lastact="RCPT TO: <". $to .">
";
fputs( $fp, $lastact);
$lastmessage = fgets ($fp,512);
if (substr($lastmessage,0,3) != 250) return "错误信息7:$lastmessage".__LINE__;

//DATA
$lastact="DATA
";
fputs($fp, $lastact);
$lastmessage = fgets ($fp,512);
if (substr($lastmessage,0,3) != 354) return "错误信息8:$lastmessage".__LINE__;

//处理Subject头
$head="Subject: $subject
";
$message = $head."
".$message;

//处理From头
$head="From: $from
";
$message = $head.$message;

//处理To头
$head="To: $to
";
$message = $head.$message;

//加上结束串
$message .= "
.
";

//发送信息
fputs($fp, $message);
$lastact="QUIT
";

fputs($fp,$lastace);
fclose($fp);
return 0;
}
}
?>

然后建立一个发送页面：sendEmail.php

require_once('sendemail.class.php');

if((isset($_POST["send"]))&&($_POST["send"]=="form1"))
{

//获取收件人地址
$sendto=$_POST['txt1'];
$sendfrom="发件人邮箱";
$mailpass="发件人邮箱密码";
$mailserver="邮箱服务器";
$subject=$_POST['txt3'];
$message =$_POST['textarea'];
$sm = new smail( $sendfrom, $mailpass, $mailserver);
$end = $sm->send( $sendto, $sendfrom, $subject, $message );
if( $end ) echo $end;
else echo "";

}
?>