From en.secnews.gr
YAHOO MAIL DOWN: Yahoo Mail is out of order this morning in a major disruption that seems to affect hundreds of users. Below you will find some updates on the subject from Thursday morning until now.
UPDATE TWO: Yahoo Mail is offline for about two hours.
Η Downdetector the service still logs over 4.000 reports from customers who insist the service is not functioning properly.
Many Yahoo Mail users are still reporting on Twitter for the shutdown.
It is not clear at this time when the malfunction will be addressed.