Possibly a further complication along the lines of this, @Badger9:
https://community.talktalk.co.uk/t5/Email/Important-information-about-changes-to-your-TalkTalk-Email...
If you are a current Talktalk broadband customer, your legacy email addresses need to be linked to the Talktalk account.
Are you seeing a banner about Everymail when you try to send?
If you are no longer a Talktalk/ ex Shell customer, you will need to subscribe to Everymail.
https://community.talktalk.co.uk/t5/Articles/Email-Transition-FAQs/ta-p/3114888
Gliwmaeden2, a fellow customer.
From the 29th of March our TalkTalk Community will move to peer-to-peer support and the TalkTalk team will no longer be here to support with queries. Don’t worry we still have plenty of ways to reach out if you need to speak to TalkTalk directly. For more details check out the link in the post at the top of any forum message board.
