In Bella's emails to Alice that are being returned undelivered, we watch Bella send an email, and as per the giant list of returns, it bounces back.

However, the dates are all wrong. The email that drops into her inbox as undelivered is dated February 1st. But all the returned emails in her inbox are future dated - February 2nd...3rd...4th... and so on.

There certainly is a Mail Delivery Failure message marked "Today", but the new mail sound dings, and the Mail Delivery Failure marked February 1 is suddenly highlighted, as if that is the one that came in.