Application Express :: Can't Send Email Using 3.0.1.00.07 Oracle 10g

Can't send an email using Application Express 3.0.1.00.07 on oracle 10g.

my code is:
DECLARE
l_body CLOB;
v_email varchar(30);
BEGIN

SELECT CONTACT_EMAIL
INTO v_email
FROM persal_info
WHERE TRIM(PERSAL)= TRIM(:P48_PERSAL);
l_body := 'Your access code for the Transport system is:'|| :P48_CODE ;
l_body := l_body || '

This access code is needed in order for you to complete the claim form. It is important to change this access code for the confidentiality of your information.';

apex_mail.send( p_to => v_email,
p_from => 'PietC@google.com',
p_body => l_body,
p_subj =>'Access Code'
);