Problem with hotmail SMTP servers....

I was trying to send a mail through Gmail using hotmail smtp server but I am getting an error. Earlier everything was fine. I used the same method for more than 3 yrs now. Only I am seeing the error. Don't know why.


SMTP Server: smtp.live.com Port:25
* Selected Secured Connection Using TLS

Authentication failed. Please check your username/password.
[Server response: 535 5.2.1 Login to your account via a web browser to verify your account. code(535) ]

Anybody to help me? Please kindly do me the favor. Thank you...