Windows live mail client windows 7

Ok I am using the windows Live mail 2012 client on my widows 7 laptop, I am receiving mail but have tried so send mail without success, I keep getting this error message - This message could not be sent because the server rejected the sender's email address. The senders email address was *******.

Subject ****************

Server error 530

Server response: 530 5.7.57 SMTP: Client was not authenticated to send anonymous mail during MAIL FROM

[DB6PR0202CA0027 euprd02prod.outlook.com]

Server 'smtp-mail.outlook.com'

Windows Live Mail Error ID 0x800CCC78

Protocol: SMTP

Port 25

can't read the next part as will not scroll that far down but hope the above is helpful

Steve