Oracle - ORA-29279: SMTP permanent error: 503 5.0.0 Need MA

tengo este script:
DECLARE
c UTL_SMTP.connection;
BEGIN
dbms_output.put_line('opening connection');

c := UTL_SMTP.OPEN_CONNECTION ('172.17.254.40');
UTL_SMTP.HELO (c, '172.17.254.40');
UTL_SMTP.MAIL (c, '[email protected]',NULL);
UTL_SMTP.RCPT (c, '[email protected]', NULL);
UTL_SMTP.DATA (c, 'SUBJECT: Hello ');
UTL_SMTP.DATA (c, 'this is a test mail');
UTL_SMTP.QUIT (c);
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line(SQLERRM);
END;

y da el error:

opening connection
ORA-29279: SMTP permanent error: 503 5.0.0 Need MAIL command

NECESITO SABER COMO SOLUCIONARLO.
GRACIAS