sudo apt-get install sendmail 

sudo /etc/init.d/sendmail start 

[mail function] 
SMTP = localhost 
smtp_port = 25 
sendmail_from = me@example.com 

<?php 
/* 调用PHPMailer发送电邮 
* @param String $receiver   收件人 
* @param String $sender    发件人 
* @param String $sender_name 发件人名称如为空则用发件人地址代替 
* @param String $subject   邮件主题 
* @param String $content   邮件内容 
* @param boolean $ishtml    是否html电邮 
* @param Array  $attachements 附件 
* @return boolean 
*/ 
function sendMail($receiver, $sender, $sender_name, $subject, $content, $ishtml=true, $attachments=array()) { 
  include_once "class-phpmailer.php";  
 
  if(empty($receiver) || empty($sender) || empty($subject) || empty($content)){ 
    return false; 
  } 
   
  $mail = new PHPMailer();  
 
  //$mail->IsSMTP();        // 经smtp发送  
  //$mail->Host = "smtp.gmail.com"; // SMTP 服务器 
  //$mail->Port = 465;       // SMTP 端口 
  //$mail->SMTPSecure = 'ssl';   // 加密方式 
  //$mail->SMTPAuth = true;     // 打开SMTP认证 
  //$mail->Username = "username";  // 用户名 
  //$mail->Password = "password";  // 密码 
 
  $mail->IsMail();         // using PHP mail() function 有可能會出現這封郵件可能不是由以下使用者所傳送的提示 
       
  $mail->From = $sender;      // 发信人  
  $mail->FromName = $sender_name;  // 发信人别名  
  $mail->AddReplyTo($sender);    // 回覆人 
  $mail->AddAddress($receiver);   // 收信人  
 
  // 以html方式发送 
  if($ishtml){ 
    $mail->IsHTML(true); 
  } 
 
  // 发送附件 
  if($attachments){ 
    if(is_array($attachments)){ 
      $send_attachments = array(); 
 
      $tmp_attachments = array_slice($attachments,0,1); 
      if(!is_array(array_pop($tmp_attachments))){ 
        if(isset($attachments['path'])){ 
          array_push($send_attachments, $attachments);           
        }else{ 
          foreach($attachments as $attachment){ 
            array_push($send_attachments, array('path'=>$attachment)); 
          } 
        } 
      }else{ 
        $send_attachments = $attachments; 
      } 
 
      foreach($send_attachments as $attachment){ 
        $attachment['name'] = isset($attachment['name'])? $attachment['name'] : null; 
        $attachment['encoding'] = isset($attachment['encoding'])? $attachment['encoding'] : 'base64'; 
        $attachment['type'] = isset($attachment['type'])? $attachment['type'] : 'application/octet-stream'; 
        if(isset($attachment['path']) && file_exists($attachment['path'])){ 
          $mail->AddAttachment($attachment['path'],$attachment['name'],$attachment['encoding'],$attachment['type']); 
        } 
      } 
    }elseif(is_string($attachments)){ 
      if(file_exists($attachments)){ 
        $mail->AddAttachment($attachments); 
      } 
    } 
  } 
 
  $mail->Subject = $subject; // 邮件标题 
  $mail->Body   = $content; // 邮件內容 
  return $mail->Send();  
} 
 
// DEMO示例如下： 
$receiver = 'receiver@test.com'; 
$sender = 'sender@test.com'; 
$sender_name = 'sender name'; 
$subject = 'subjecct'; 
$content = 'content'; 
 
// 四种格式都可以 
$attachments = 'attachment1.jpg'; 
$attachments = array('path'=>'attachment1.jpg', 'name'=>'附件1.jpg'); 
$attachments = array('attachment1.jpg','attachment2.jpg','attachment3.jpg'); 
$attachments = array( 
  array('path'=>'attachment1.jpg', 'name'=>'附件1.jpg'), 
  array('path'=>'attachment2.jpg', 'name'=>'附件2.jpg'), 
  array('path'=>'attachment3.jpg', 'name'=>'附件3.jpg'), 
); 
$flag = sendMail($receiver, $sender, $sender_name, $subject, $content, true, $attachments); 
echo $flag; 
?>