我使用代码发送电子邮件：
<?php
$to = "someone@example.com";
$subject = "Test mail";
$message = "Hello! This is a simple email message.";
$from = "someonelse@example.com";
$headers = "From:" . $from;
mail($to,$subject,$message,$headers);
echo "Mail Sent.";
?>
但我得到了：
发送邮件：致命：chdir/库/服务器/邮件/数据/线轴：没有这样的文件或目录
而且我不知道如何添加附件，重要的是我需要指定附件的内容类型，任何人都可以帮助我吗？
谢谢！
<?php
$to = "someone@example.com";
$subject = "Test mail";
$from = "someonelse@example.com <someonelse@example.com>";
$message = "Hello! This is a simple email message.";
// let's say you want to email a comma-separated-values
$tofile = "col1,col2,col3'n";
$tofile .= "val1,val1,val1'n";
$filename = "filename.csv";
$random_hash = md5(date('r', time()));
$attachment = chunk_split(base64_encode($tofile));
$headers = "From: " . $from . "'r'n";
$headers .= "MIME-Version: 1.0'r'n";
$headers .= "Content-Type: multipart/mixed; boundary='"PHP-mixed-".$random_hash."'"'r'n";
$headers .= "X-Priority: 3'r'n";
$headers .= "X-MSMail-Priority: Normal'r'n";
$headers .= "X-Mailer: PHP/" . phpversion();
$body = "--PHP-mixed-".$random_hash."'r'n";
$body .= "Content-Type: text/plain; charset='"UTF-8'"'r'n";
$body .= "Content-Transfer-Encoding: 8bit'r'n";
$body .= $message;
$body .= "'r'n'r'n";
$body .= "'r'n--PHP-mixed-" . $random_hash . "'r'n'r'n";
$body .= "--PHP-mixed-".$random_hash."'r'n";
$body .= "Content-Transfer-Encoding: base64'r'n";
$body .= "Content-Type: text/comma-separated-values; name='"" . $filename . "'" charset='"UTF-8'"'r'n";
$body .= "Content-Disposition: attachment; filename='"" . $filename . "'"'r'n'r'n";
$body .= $attachment;
$body .= "'r'n--PHP-mixed-".$random_hash."--";
mail($to, $subject, $body, $headers);
?>