I've requested that full access is restored for the email address mailbox in your Community profile, Personal information, Private notes.
TalkTalk Support will respond here and access returned within a couple of working days after that. Until then use TalkTalk Mail webmail via an up to date Internet browser to keep in touch with email contacts.
Are you confident that you need no help with checking the services / devices / email software for compatibility with TLS 1.2 encryption and the incoming and outgoing server settings you're using? Did you identify the insecure settings, for example? The culprit device or software that got your mailbox access switched off?
