No email address in the "Bcc"

[opensaas]

When I send a message to a recipient who is in the "Bcc" and configuracji default_host is NULL and do not set the SMTP configuration, after sending the email sent in the "Bcc" is the e-mail address. Attachment 1.jpg or http://d.opensaas.pl/roundcubemail-image/1.png
If you send the same message and I will add the configuration of SMTP and default_host, "after sending the email sent in the" Bcc "there is no email address. Attachment 2.jpg  or http://d.opensaas.pl/roundcubemail-image/2.png

How to fix the error occurs?

Tested on several versions and all are having the same problem:

• roundcubemail-0.9.5
  roundcubemail-1.0-beta
  roundcubemail-1.0-rc

[JohnDoh]

This has been confirmed as an IMAP server issue

http://trac.roundcube.net/ticket/1489796