wp-mail.php bug

Hey WP developers,

There’s a bug in current wp-mail.php which prevents it from correctly processing e-mails with subjects in quoted-printable encoding. In lines 53-55, we have this:

if (!preg_match(‘#\=\?(.+)\?Q\?(.+)\?\=#i’, $subject)) {
$subject = wp_iso_descrambler($subject);
}

First of all, the regex check is incorrect – it should be

// No exclamation mark.
if (preg_match(‘#\=\?(.+)\?Q\?(.+)\?\=#i’, $subject)) {
$subject = wp_iso_descrambler($subject);
}

Even more, however, – this regex check is unnecessary here, since it’s done (correctly) in wp_iso_descrambler () anyway. So these three lines have to simply be replaced with:

$subject = wp_iso_descrambler($subject);

I’ve found this bug while experimenting with the blogging via e-mail feature. After the fix, everything works beautifully.

Thanks for the great product!