I started getting notes from some of you as well as numerous others in my email contact list yesterday afternoon. I started trying to fix it then, to no avail.
It appears it wasn't just my account but some sort of systemic AT&T/Yahoo problem. Fortunately many of my contacts had excellent filters and the spam was denied. The question remains if I'll be able to send individual email to these contacts in the future. Time will tell.
AT&T/Yahoo are working on the problem and will/have resolve(d) it.
Below is the notice you'll find after stumbling around awhile;
Alert: Intermittent Password IssuesThank you for your understanding and my apologies for my part (having your email address).
AT&T has identified several intermittent password-related issues that may impact customers, including the following:
Customer email passwords suddenly stop working
After password resets, customers are unable to access email
Customers are getting caught in password reset loops
The "Remember Me" password option for email isn't always working
Customers are unable to send/receive email with new mail settings
Please be aware that AT&T is working to resolve these issues. If you are experiencing any of the symptoms above and have been unsuccessful accessing your email or resetting your password, please Contact Us for more assistance.