you might almost be tempted to respond if you didn’t realize that this email did not originate from rocketmail or yahoo which are the email provider for this account.
Dear account user
Your mailbox has exceeded the limit of 30 GB, which is as set by your
manager, you are currently at 30.9GB, very soon you will not be able to
create new e-mail to send or receive again until you validate your
mailbox.To re-validate your mailbox, click on the link below and
follow the instruction for your upgrade