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When you click on the "HERE" tab it takes you to a very shady looking site asking for passwords and such. I don't think this is a legitimate email from Cox but wanted to double check since I don't want my account to close.
Dear Cox E-mail Holder,
Cox Internet Security Department have detected some security problem on your Cox E-mail account, and this might lead to your account closure if immediate action is not taken.
Click HERE and re-validate your account information to resolve this problem.
Cox Email Alert Team
[moderator edit: phishing link removed]
Am not a tech but the email sounds like phishing - never click on links! I'd just log directly in and reset your password. Phishing can look "real", beware. Main thing, do not click on the links.