Yahoo users who have received fake upgrade email messages like the one below, which claim their accounts will be deactivated if they do not update, are asked to delete them. This is because the fake email messages are phishing scam being sent by cybercriminals to steal Yahoo usernames and passwords, by tricking Yahoo users into visiting a phishing website that steals email account credentials.
A "Yahoo Upgrade Now to the Newest Version" Phishing Scam
From: Mail-Care Team <oanasimi10@yahoo.com>
Date: July 3, 2019 at 10:34:15 AM PDT
Subject: ** Upgrade***
Reply-To: Mail-Care Team <oanasimi10@yahoo.com>
Dear user,
We are closing all old Version of Your E-mail as from today WEDNESDAY JULY (3/07/2019). Tap below and sign-in to get a more organized mailbox to avoid being De-activated.
UPGRADE NOW TO THE NEWEST VERSION
Thank You.
YAHOO!----Mail support
The link in the phishing email message goes to a fake or phishing Yahoo website, which will attempt to trick the potential victims into entering their usernames and passwords on it. If Yahoo users attempt to sign into phishing website with their Yahoo usernames and passwords, it will be sent to the cybercriminals behind the email scam, who will use the information to hijack their accounts. The hijacked Yahoo accounts will then be used by cyber criminals fraudulently.
Yahoo users who have received email messages asking them to click on a link to update or upgrade their accounts are asked to go directly to their email accounts at https://mail.yahoo.com, instead of clicking on the links in the email messages. If there is something that needs to be done to their accounts they will be notified after signing in. And, Yahoo users who have already been tricked by the phishing scam, are asked to change their passwords immediately before their Yahoo accounts are hijacked and used fraudulently.