SendMail PL/SQL

desenvolvi em PL / SQL uma procedure que envia email que está funcionando perfeitamente. Porém foi mudado o servidor de email para Gmail, que requer autenticação e o tipo de conexão é SSL. Poderiam me ajudar com essas alterações?
A versão do banco de dados é o 11.


CREATE OR REPLACE PROCEDURE PRC_JUN_SEND_MAIL
(
TO_NAME VARCHAR2,
SUBJECT VARCHAR2,
MESSAGE VARCHAR2
)
IS
L_BODY VARCHAR2(32767);

L_MAILHOST VARCHAR2(64) := ''smtp.gmail.com'';
P_USERNAME_ VARCHAR2(50) := ''admin@jun.net'';
P_PASSWORD_ VARCHAR2(50) := ''***********'';
L_DE VARCHAR2(64) := ''Remetente'';
L_FROM VARCHAR2(64) := ''admin@jun.net'';
l_port VARCHAR(7) := ''587'';
L_MAIL_CONN UTL_SMTP.CONNECTION;


BEGIN
L_MAIL_CONN := UTL_SMTP.OPEN_CONNECTION(L_MAILHOST,l_port);
Dbms_Output.Put_Line (''apos conectar'');
UTL_SMTP.HELO(L_MAIL_CONN, L_MAILHOST);

Dbms_Output.Put_Line (''hello'');
UTL_SMTP.COMMAND (L_MAIL_CONN, ''AUTH LOGIN'');
Dbms_Output.Put_Line (''AUTH LOGIN'');
UTL_SMTP.COMMAND (L_MAIL_CONN, UTL_RAW.CAST_TO_VARCHAR2(
UTL_ENCODE.BASE64_ENCODE(UTL_RAW.CAST_TO_RAW(P_USERNAME_))));
UTL_SMTP.COMMAND (L_MAIL_CONN, UTL_RAW.CAST_TO_VARCHAR2( UTL_ENCODE.BASE64_ENCODE(UTL_RAW.CAST_TO_RAW(P_PASSWORD_))));
UTL_SMTP.MAIL(L_MAIL_CONN, L_FROM);
UTL_SMTP.RCPT(L_MAIL_CONN, TO_NAME);

UTL_SMTP.OPEN_DATA(L_MAIL_CONN);

UTL_SMTP.WRITE_RAW_DATA( L_MAIL_CONN, UTL_RAW.CAST_TO_RAW(''FROM:'' ||L_DE||''<''|| L_FROM|| ''>'' || UTL_TCP.CRLF));
UTL_SMTP.WRITE_RAW_DATA( L_MAIL_CONN, UTL_RAW.CAST_TO_RAW(''TO:'' ||TO_NAME||UTL_TCP.CRLF));
UTL_SMTP.WRITE_RAW_DATA( L_MAIL_CONN, UTL_RAW.CAST_TO_RAW(''SUBJECT:'' ||SUBJECT||UTL_TCP.CRLF));
UTL_SMTP.WRITE_RAW_DATA( L_MAIL_CONN, UTL_RAW.CAST_TO_RAW(''CONTENT-TYPE: TEXT/HTML; CHARSET=ISO-8859-1''||UTL_TCP.CRLF));
UTL_SMTP.WRITE_DATA(L_MAIL_CONN, '' ''||UTL_TCP.CRLF);

UTL_SMTP.WRITE_RAW_DATA(L_MAIL_CONN, UTL_RAW.CAST_TO_RAW(UTL_TCP.CRLF||MESSAGE));

UTL_SMTP.CLOSE_DATA(L_MAIL_CONN);

UTL_SMTP.QUIT(L_MAIL_CONN);
END;