Keep getting mail that says:
I havent clicked the link because last time I did my safety alert said SITE UNSAFE.
ATT|YAHOO
WARNING MAILBOX LIMITED
This is the actual email, and the sender is: ***************@bellsouth.net
Your AT&T Yahoo Mail Version is outdated and has expired in the database.
Failure to Upgrade to the newest AT&T Mail Version 12.9 will result in inefficient usage of mailbox and might result to shutdown
CLICK HERE To re-validate your mailbox .
Thank you!
AT&T Yahoo Mail

The email is not legit. Never trust an email that asks you to sign in through a link. We would suggest changing your password and securing your account: https://help.yahoo.com/kb/new-mail-for-desktop/secure-yahoo-account-sln2080.html