Can’t send with smtp.live.com, error 0x800CCC78

The message could not be sent because the server rejected the sender's email address. The sender's email address was Hotmail.com WLM

Subject 'try'
Server Error: 530
Server Response: 530 5.7.0 Must issue a STARTTLS command first
Server: 'smtp.live.com'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 25
Secure(SSL): No

[Original subject: can:r send out emails in WLM]