Encrypt Saved Copy of the Mail that one sends

Whenever a user enables the preference ‘Encrypt saved copy of the mail that you send’, the sent mails are moved to the TRASH and not to the sent view. Is it a bug. When this preference is deselected, all works fine.Also, these encrypted mails are logged by Groupshield for Domino 5 and it shows as if these mails are virus infected, quarantined and never delivered.

The truth is that these mails are delivered normally.

Can someone please explain what is wrong?

Thanks