I'm sending emails through Outlook but the receiving is giving error message 0x800421A.
If restarted PC and restrated router but still getting the error
quick Google search for it came up with this article on how to resolve this problem:-
I am not employed by TalkTalk, I'm just a customer. If my post has fixed the issue, please mark it as the Best Answer.
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How are you getting on? We have been experiencing some issues with our email platform over the weekend which may be causing your problem. (you can find the latest update on the email issue here)
Chris, Community Team