我有以下标题要传递给 由于我不要求用户提供 一个电子邮件地址，我可以排除“发件人”和“回复”字段，让服务器自动完成这些值，或者此操作会导致格式错误的标题吗？
mail（）函数：
$ headers =“MIME-Version：1.0
”;
$ headers。=“X-Mailer：PHP /”。 phpversion（）。“
”;
$ headers。=“From：”。$ sender_email。“
”;
$ headers。=“主题：”。$ subject。“
\ n“;
$ headers。=”回复：“。$ sender_email。”“。 “
”;
$ headers。=“Content-Type：multipart / mixed; boundary =”。md5（'boundary1'）。“
”;
$ header 。=“ - ”。md5（'boundary1'）。“
”;
$ headers。=“Content-Type：multipart / alternative; boundary =”。md5（'boundary2'）。“
“;
$ headers。=” - “。md5（'boundary2'）。”
“;
$ headers。=”Content-Type：text / plain; charset = ISO-8859-1
“;
$ headers。= $ message。”
“;
$ headers。=” - “。 md5（'boundary2'）。“ -
”;
$ headers。=“ - ”。md5（'boundary1'）。“
”;
$ headers。=“Content- 键入：“。$ file_type。”;“;
$ headers。=”name = \“”。$ file_name。“\”
“;
$ headers。=”Content-Transfer-Encoding：base64
“;
$ headers。=”Content-Disposition：attachment;“;
$ headers。=”filename = \“”。$ file_name。“\”
“;
$ headers 。=“X-Attachment-Id：”。rand（1000,9000）。“
”;
$ headers。= $ encoded_content。“
”;
$ headers。 =“ - ”。md5（'boundary1'）。“ - ”;
$ sentMail = @mail（$ recipient_email，$ subject，$ message，$ headers）;
I have the following headers that I want to pass to the mail() function:
$headers = "MIME-Version: 1.0
";
$headers .= "X-Mailer: PHP/" . phpversion()."
";
$headers .= "From:".$sender_email."
";
$headers .= "Subject:".$subject."
";
$headers .= "Reply-To: ".$sender_email."" . "
";
$headers .= "Content-Type: multipart/mixed; boundary=".md5('boundary1')."
";
$headers .= "--".md5('boundary1')."
";
$headers .= "Content-Type: multipart/alternative; boundary=".md5('boundary2')."
";
$headers .= "--".md5('boundary2')."
";
$headers .= "Content-Type: text/plain; charset=ISO-8859-1
";
$headers .= $message."
";
$headers .= "--".md5('boundary2')."--
";
$headers .= "--".md5('boundary1')."
";
$headers .= "Content-Type: ".$file_type."; ";
$headers .= "name=\"".$file_name."\"
";
$headers .= "Content-Transfer-Encoding:base64
";
$headers .= "Content-Disposition:attachment; ";
$headers .= "filename=\"".$file_name."\"
";
$headers .= "X-Attachment-Id:".rand(1000,9000)."
";
$headers .= $encoded_content."
";
$headers .= "--".md5('boundary1')."--";
$sentMail = @mail($recipient_email, $subject, $message, $headers);
Since I don't require the user to provide an e-mail address, can i exclude the "From" and Reply-To" fields and let the server auto-complete those values or would this action result in a malformed headers?
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