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I’m frustrated

Twitter tells me that my email address isn't working.

I keep getting the following notice:

Is your email address active?
We've tried to send emails to (my address), but they are not getting delivered, possibly because your email address is no longer valid. Click here to update your email settings, or click here to try sending messages to your email address again.

The email is CORRECT. I've re-entered it 20 times. But I still keep betting the message. Any suggestions?