It is all very well saying that this topic is an open incident but it has been a problem area for some time. There are the problems of sending messages which are not accepted - whether this is because of SPAM or TalkTalk's DMARC policy - and the endless SPAM messages which say they are from TT, using @talktalk.net addresses, threatening to cut us off if we don't reconfirm our account. I have been told that we can no longer set up any alternative email addresses, that forwarding is no longer possible because it will be rejected, and that TT is dealing with some fraudulent activity. This should be treated as a major incident with all customers being kept up to date on what are the known problems and what TT is doing about it. I see also that one of TT's associated companies has lost a lot of customer data so not much going well at the moment - oops!
