User account for chat or sending mails?

Highlight their message. Then, on the bar, go to Message, and then Block Sender.

UNFORTUNATLY, i am pretty sure you cant. Yahoo only limites you to the people that you email, or have in your email-adress book. It also only limits you to only people that uses Yahoo as well. Also,...

A user account is an account supplied by a user before he/she uses a particular system that requires it for identification and authentication purposes.

The most common form of 'Hacking' users accounts on websites, or computers is simply to acquire that users password. It is reasonably simple and unglamorous, very unlike anything seen in the movies....

When in gmail, go to the top corner and click settings. You will find an option that will allow you to receive mail from any email address you want. Including yahoo, hotmail, lycos, and even another...