[noppid]

Originally Posted by triste

filesize the $attachpath, but it wouldn't work if your using the database for saving the attachments.

or this,

ob_start();
imagejpeg($im, "", 95);
header('Content-Length: ' . ob_get_length());
ob_end_flush();

i tried finding a function to find the size of an image resource, but didn't find one.

Use sizeof() to get a string length.
http://us4.php.net/manual/en/function.sizeof.php