Emails are coming through both on my iPhone & computer, yet I can't open them

Emails are coming through both on my iPhone & computer, yet I can't open them.

It's saying I have unread messages, but won't let me open them. I did get one open, but it will not let me reply. At first it says "sending" then says "error sending message" "your message could not be sent [messagesavefailed]" & on my iPhone, it says it's downloading the messages, but then they don't appear, yet it still says 3 unread messages.

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