Once the cybercriminals have received the account credentials, they will use it to gain access to their victims' accounts, hijack and use them fraudulently.
The "Yahoo Incoming Mails Placed on Pending Status due to Upgrade" Scam
From: AT&T ALERT! [mailto:firstname.lastname@example.org]
Sent: Saturday, September 16, 2017 10:48 AM
Subject: Mail service!
ATT Yahoo! services
Your two incoming mails were placed on pending status due to the recent upgrade to our Terms, In order to receive the messages Update Now to login and wait for response from ATT User.