smtp_to function is not working

Hi ,

I am using smtp_to function to send an email . 

I have configured in the server manager  with outgoing server and sender email address.

I have written small script.

smtp_to($GV_Email_Address , $GV_Email_Message  ,$GV_Email_Subject,10,10 );

I have executed the  function in small script  and getting error

5104 18564    EML-160201 3/5/2014 12:55:52 PM    SMTP Error Code : <550>. For more information, see your SMTP server manual.

How can I send a mail without giving outlook password. How can I resolve this issue.

Thanks & Regards,

Ramana.