I also noticed a change over the weekend with 70 odd mails being delivered from over 4 days ago. Then I had a phone call from BT (I actually though it was a spam one at first!) anyway they were asking about the complaint I had made re the email and said there had been a server issue and also a spam email! Had caused problems with my account. He asked if it was working ok now and I told him yes and so the ticket is closed. Let's hope it's the same for all of us.