UTL_SMTP???

I have started some procedure with using UTL_SMTP package on WIN2000. I put "localhost" for smtp_server but what I need to put for mail name. I always have next error messages:
SQL> exec mail_files(from_name => 'oracle', to_name =>
'ilica.brnadic_at_zg.hinet.hr', subject => '
A test', message => 'A test message', filename1 => 'g:\oracle\logs\1.txt', filename2 => 'g:\oracle
\logs\2.txt');
BEGIN mail_files(from_name => 'oracle', to_name =>
'ilica.brnadic_at_zg.hinet.hr', subject => 'A te

*
ERROR at line 1:

ORA-20002: 550 5.7.1 Unable to relay for ilica.brnadic_at_zg.hinet.hr
ORA-06512: at "SYS.UTL_SMTP", line 86
ORA-06512: at "SYS.UTL_SMTP", line 223
ORA-06512: at "SYSTEM.MAIL_FILES", line 140
ORA-06512: at line 1

--
with regards,

ilica

_________

"If A is a success in life, then A equals x plus y plus z. Work is x; y is
play; and z is keeping your mouth shut."