<?php

$to = "test@163.com"; //收件人

$subject = "Test"; //主题

$message = "This is a test mail!"; //正文

mail($to,$subject,$message);

<?php

$to = "test@163.com";//收件人

$subject = "Test";//邮件主题

$message = "This is a test mail!";//邮件正文

ini_set('SMTP','smtp.163.com');//发件SMTP服务器

ini_set('smtp_port',25);//发件SMTP服务器端口

ini_set('sendmail_from',"admin@163.com");//发件人邮箱

mail($to,$subject,$message);

<?php

// Pear Mail 扩展

require_once('Mail.php');

require_once('Mail/mime.php');

require_once('Net/SMTP.php');

$smtpinfo = array();

$smtpinfo["host"] = "smtp.163.com";//SMTP服务器

$smtpinfo["port"] = "25"; //SMTP服务器端口

$smtpinfo["username"] = "username@163.com"; //发件人邮箱

$smtpinfo["password"] = "password";//发件人邮箱密码

$smtpinfo["timeout"] = 10;//网络超时时间，秒

$smtpinfo["auth"] = true;//登录验证

//$smtpinfo["debug"] = true;//调试模式

// 收件人列表

$mailAddr = array('receiver@163.com');

// 发件人显示信息

$from = "Name <username@163.com>";

// 收件人显示信息

$to = implode(',',$mailAddr);

// 邮件标题

$subject = "这是一封测试邮件";

// 邮件正文

$content = "<h3>随便写点什么</h3>";

// 邮件正文类型，格式和编码

$contentType = "text/html; charset=utf-8";

//换行符号 Linux: \n Windows: \r\n

$crlf = "\n";

$mime = new Mail_mime($crlf);

$mime->setHTMLBody($content);

$param['text_charset'] = 'utf-8';

$param['html_charset'] = 'utf-8';

$param['head_charset'] = 'utf-8';

$body = $mime->get($param); 

$headers = array();

$headers["From"] = $from;

$headers["To"] = $to;

$headers["Subject"] = $subject;

$headers["Content-Type"] = $contentType;

$headers = $mime->headers($headers); 

$smtp =& Mail::factory("smtp", $smtpinfo);

$mail = $smtp->send($mailAddr, $headers, $body);

$smtp->disconnect();

if (PEAR::isError($mail)) {

  //发送失败

  echo 'Email sending failed: ' . $mail->getMessage()."\n";

}

else{

  //发送成功

  echo "success!\n";

}