[otrs] Questions about PGP and attachments

Hello ! I just stumpled upon a little problem here: We wanted to use OTRS to send out encrypted Emails to clients - including attachments. To my surprise, the emails are crypted but the attachment is sent as is. Is there an easy way to change this behaviour so the entire message is encrypted ? Also: When receiving encrypted Emails, everything is correctly decrypted. Unfortunately this only works with messages that are entirely encrypted. We sometimes get plain text emails with encrypted attachments. - Those are not decrypted automatically and the attachments have to be downloaded and decrypted offline. If someone has a tip how to change this, that would be great ! Cheers, David