BlackBerry Enterprise Server & Lotus Domino: unencrypted outgoing mail

We use BES & Lotus Domino

There is a problem:

We send an email from BlackBerry to Notes user

BES receives our email

BES puts the email into Lotus Domino server, joined with BES

Lotus Domino sends the email to recipient’s Lotus Domino mail server

Recipient’s mail server encrytps the email with recipient’s public Notes key

But! Body field is still unencrypted!

As it turned out, BES doesn’t mark message’s Body field as needed to be encrypted, in other words BES doesn’t set SEAL flag for the field.

Any ideas to workaround this security issue?

I’ve posted this question on BlackBerry forum, but there is no answer…

http://www.blackberryforums.com/bes-admin-corner/121375-bes-lotus-domino-unencrypted-outgoing-mail.html

And another interesting question… Does RIM, the BlackBerry vendor, have IBM certification with such a awful security bugs?