Have received email with subject heading ACTION REQUIRED: Mailbox storage Full
Is this a scam /phishing email? The constant message says -
We regret to inform you that your mailbox quota has been exceeded. This means that you won't be able to receive or send emails until you make some space in your mailbox.
To resolve this issue, we recommend that you either delete some of your old emails, or upgrade your mailbox storage. If you'd like to upgrade your mailbox storage, please click the button below to learn more: