Policy Based Encryption Advanced Encrypted Portal

Hi Guys

We have been using the Policy Based Encryption Advanced Encrypted Portal for a while now.

Just a quick question whicvh one of our compliance people brought up  , is there any way to ensure that mail is readable only by the intended recipient?

For example if an encryped mail is sent to the wrong email address and the mistaken recipient already has an account for the encrypted portal , that person would be able to read the mail right?

The question they are asking is , is there a PBE Advanced way to ensure only the intended recipient can read the email.

Thanks

John