Yahoo Mail Upgrade Warning 2024. The ‘upgrade and verify your mailbox’ phishing scam email is a fraudulent attempt by cybercriminals to obtain sensitive information from unsuspecting individuals. One such scam that has been on the rise is the “upgrade your mailbox” phishing scam email.

Answered view answer in the context of this discussion report post We have seen a really sharp increase in the last week from a number of users that are recieving errors and bounceback messages from yahoo email addresses.