There's a new email address for subbing fiction to My Weekly. If you're one of those who are permitted to send work you should have been notified of this – contact the fiction editor on the old address if not. (I'm not putting it here because that will result in subs and queries from those not on the list and defeat the purpose of this change.)
The idea is that submissions will be acknowledged automatically, saving Karen time. Unfortunately there's a technical glitch with that aspect at the moment. Hopefully it'll be sorted soon. The stories are still getting through though and you should hear back in the usual way.
Update – I've been told the same issue currently applies to subs to The Weekly News too.