[Evolution] pgp/gpg implementation doesn't work correctly

[Kleiner Hampel <kleiner_hampel gmx de>]

Hello,

i want to sign/encrypt my messages with evolution.
But evolution always APPENDS the signed part/encrypted part to the
message.
I want evolution signing/encrypting my messages without appending
anything.
Like KMail:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

.......

-----BEGIN PGP SIGNATURE-----
Version: GnuPG ....
.............

-----END PGP SIGNATURE-----

How can make evolution doing this?

regards,
hampel