Cambia esto
Código PHP:
//Inicia el 1
$message .= "--{$mime_boundary}\n" .
"Content-Type: {$type1};\n" .
" name=\"{$name1}\"\n" .
"Content-Transfer-Encoding: base64\n\n" .
$data1 . "\n\n" .
"--{$mime_boundary}--\n";
por esto
Código PHP:
//Inicia el 1
$message .= "--{".$mime_boundary."}\n" .
"Content-Type: {".$type1."};\n" .
" name=\"{".$name1."}\"\n" .
"Content-Transfer-Encoding: base64\n\n" .
$data1 . "\n\n" .
"--{".$mime_boundary."}--\n";
Saludos