Gnus PGG : Encrypt to Self

When I send a PGP encrypted email to someone inside Gnus with PGG I
want the email to be sent encrypted to the recipient as well as
myself. This way I can still read the encrypted message later from my
"Sent Mail" box.

It appears that I want to set inside my ~/.gnus:

(setq pgg-default-user-id "my_user <at> my_domain.com")
(setq pgg-encrypt-for-me t)

But that is not doing the trick, all messages are still only encrypted
to the recipient. Any help would be appreciated.