The link is a banner across the top of my email page not an email in and of itself, and there is a triangle of death in the refresh at the top as well.
Whenever you are informed that there is a problem with ANY account you have, of ANY type, never trust the messenger. Never click any links they give you, and never give them any information.
Instead, always go straight to the source.
If you are told there is a problem with your Yahoo email account, then go straight to mail.yahoo.com and attempt to assess the state of your account from there.
If someone tells you there is an issue with your bank account or credit card, tell them thank you, and hang up. Then call the trusted phone number that you have for your bank or credit card and assess the status of your account directly from them.