I've got the same problem with a secondary Email account with TalkTalk. I know what the problem is from previous years but it took me over 2 hours today on the telephone with them before they passed me on to 1st level technical support.
Background: If you have an Email account with them but no longer pay for any TalkTalk service, then they block sending Emails, but you still can receive them.
My problem: I pay an annual subscription charge for the Mail plus product. I use a different provider for broadband. The subscription ran out the other day so there was a block put in preventing us sending emails from 2 email accounts we have with them.
The subscription charge was renewed and the primary Email account used for my TalkTalk account was automatically unblocked to allow me to send emails again (it took a number of hours) but the system failed to re-enable the other TalkTalk Email account to allow the sending of Emails again that is used by my wife (you can have up to 5 email accounts registered). After 2 hours 43 minutes on the phone with them, they finally raised a case for the problem. They said I should hear from them by Friday.
