如果你无法在服务器上安装IMAIL，那只能通过socket来发送邮件。但是如果你幸运的话，也可以用163/sina的

smtp服务。

例程如下(原程序由马毅兄提供)：

if($sendit)

{

$smtpserver="202.110.200.242" ; //将此处设为IMAIL的IP

echo "

" ;

$fp = fsockopen($smtpserver, 25, &$errno, &$errstr, 10) ; //连接smtp服务器，端口25
if(!$fp) die("wrong open smtp SERVER") ;
$hostreplay=fgets($fp,128);
//if (!strstr($hostreplay,"220")) die(" can n't receive the 220 answer ") ;
$smailname=strstr(ltrim($hostreplay),"220 ") ;
$smailname=substr($smailname,0,strpos($smailname,".")) ;
//echo "\nsmailname:$smailname\n" ;
fputs($fp,"$smailname \n") ;
$hostreplay=fgets($fp,128);
//if (!strstr($hostreplay,"250")) die(" can n't receive the 250 answer ") ;
fputs($fp,"MAIL FROM: \n") ;
$hostreplay=fgets($fp,128) ;
if (!strstr($hostreplay,"250")) {
fputs($fp,"MAIL FROM: root\n") ;
$hostreplay=fgets($fp,128) ;
if (!strstr($hostreplay,"250")) {
fputs($fp,"MAIL FROM: root@263.net\n") ;
echo($hostreplay=fgets($fp,128)) ;
if (!strstr($hostreplay,"250")) {
fputs($fp,"MAIL FROM: $from_address\n") ;
$hostreplay=fgets($fp,128) ;
if (!strstr($hostreplay,"250")) die(" can n't receive the 250 answer ") ;
};
};
};
fputs($fp,"RCPT TO: $to_address\n") ;
$hostreplay=fgets($fp,128);
if (!strstr($hostreplay,"250")) {
fputs($fp,"RCPT TO: $mailname\n") ;
$hostreplay=fgets($fp,128) ;
if (!strstr($hostreplay,"250")) echo(" can n't receive the 354 answer") ;
};
fputs($fp,"DATA\n") ;
$hostreplay=fgets($fp,128) ;
if (!strstr($hostreplay,"354")) die(" can n't receive the 250 answer ") ;
$tosend="From: $from_address\n";
$tosend.="To: $to_address\n";
$tosend.="Subject:".str_replace("\N"," ",$subject)."\n你好，这是yukuang发给您的一封测试信！！
\n.\n";
fputs($fp,$tosend) ;
$hostreplay=fgets($fp,128) ;
if (!strstr($hostreplay,"250")) die(" can n't receive the 250 answer ") ;
fputs($fp,"QUIT\n") ;
fclose($fp) ;
echo "发送成功";
exit();
//if($ck_name!='root') die("

};

?>

该程序在局域网内调试通过，我的IP是202.110.200.242，供大家测试