Why is my webmail url suddenly being flagged as a fraudulent site?

The website that I access for online email use (https://webmail.earthlink.net) is now getting flagged with the following message.  Why?

Fraudulent Web Page Blocked

You attempted to access:

http://webmail.earthlink.net/wam/index.jsp?x=2096847012

This web page is a known fraudulent web page. It is recommended that you do NOT visit this page. 
For your protection, this web page has been blocked. Visit Symantec to learn more about phishing and internet security.