使用 PHP 附加到 MIME 电子邮件是否有最大合理文件大小？

Question

我在 IIS6 上运行 PHP。我有一些 PHP 可以成功将 1KB 图像作为电子邮件附件发送。然而，当我尝试附加 500KB PDF（已更改内容类型）时，它会挂起，几分钟后我收到“FastCGI 进程超出配置的请求超时”（错误号 258 (0x80070102)）。

您有什么想法为什么需要这么长时间才能附加 PDF？解决方案不是增加超时限制，我不能让用户在发送文件时等待 3 分钟以上。

我已在下面包含我的代码：

    $headers   = "From: ".$from."\r\n";
    $headers .= "Reply-To: ".$from."\r\n";
    $headers .= "MIME-Version: 1.0\r\n";
    $headers .= "Content-Type: multipart/mixed; boundary=\"".$uid."\"\r\n\r\n"; 
    $headers .="This is a multipart message in MIME format. \r\n\r\n";

    $headers .= "--".$uid."\r\n\r\n";
    $headers .= "Content-Type: text/plain; charset-iso-8859-1\r\n";
    $headers .= "Content-Transfer-Encoding: quoted-printable\r\n\r\n";
    $headers .= $text . "\r\n\r\n";

    $headers .= "--".$uid."\r\n\r\n";
    $headers .= "Content-Type: text/html; charset-iso-8859-1\r\n";
    $headers .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
    $headers .= $html  . "\r\n\r\n";

    $headers .= "--".$uid."\r\n\r\n";
    $headers .= "Content-Type: image/png; name=\"".$filename."\"\r\n";
    $headers .= "Content-Transfer-Encoding: base64\r\n";
    $headers .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";
    $attachment = chunk_split(base64_encode(file_get_contents($path.$filename))); 
    $headers .= $attachment . "\r\n\r\n";

    $headers .= "--".$uid."\r\n\r\n";

    //send the email 
    $mail_sent = @mail( $to, $subject, $text, $headers );

提前感谢您的任何建议。

Answer 1

将附件放在 mail() 函数的消息参数中，而不是附加标头参数中。

我今天遇到了同样的问题，发现我无法将大文件作为 mail() 函数中 headers 参数的一部分提交。

例如

$headers   = "From: ".$from."\r\n";
$headers .= "Reply-To: ".$from."\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"".$uid."\"\r\n\r\n"; 
$body .="This is a multipart message in MIME format. \r\n\r\n";

$body .= "--".$uid."\r\n\r\n";
$body .= "Content-Type: text/plain; charset-iso-8859-1\r\n";
$body .= "Content-Transfer-Encoding: quoted-printable\r\n\r\n";
$body .= $text . "\r\n\r\n";

$body .= "--".$uid."\r\n\r\n";
$body .= "Content-Type: text/html; charset-iso-8859-1\r\n";
$body .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$body .= $html  . "\r\n\r\n";

$body .= "--".$uid."\r\n\r\n";
$body .= "Content-Type: image/png; name=\"".$filename."\"\r\n";
$body .= "Content-Transfer-Encoding: base64\r\n";
$body .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";
$attachment = chunk_split(base64_encode(file_get_contents($path.$filename))); 
$body .= $attachment . "\r\n\r\n";

$body .= "--".$uid."\r\n\r\n";

//send the email 
$mail_sent = @mail( $to, $subject, $body, $headers );