For some reason I'm no longer receiving email messages from Trade Me. I have a Google Apps account and my wife and I have our own email addresses. I've also got a group email address that we're both members of. This group is our contact address for Trade Me and has worked fine up until a couple of weeks ago.

Now we're receiving nothing from @trademe.co.nz.

Buyers and sellers can still contact us direct through that address and any other test messages I've sent to that account arrive. I've checked the spam/filter settings in our individual email accounts and there's nothing blocking us there. As far as I'm aware, the group account does not have any spam filters or settings. 

If I change the contact address at Trade Me back to my own email address then messages come through. Does anyone have any insite as to why this would fail?