Duplicate emails being sent out to bcc

Hi,

I’m using RT 3.6.7.

Our users sometimes put an internal email in the bcc when replying to
a requestor. I have found that sometimes the bcc recipient receives
the email twice.

Looking at the history of the ticket, I see the following:

Mon Oct 27 15:31:48 2008 RT_System - Status changed from

‘new’ to ‘open’

Mon Oct 27 15:31:48 2008 RT_System - Outgoing email recorded [Show]

Mon Oct 27 15:31:48 2008 RT_System - Outgoing email recorded [Show]

Mon Oct 27 15:31:48 2008 RT_System - Outgoing email recorded [Show]

Mon Oct 27 15:31:51 2008 pstringer - Status changed from ‘open’

to ‘resolved’

Clicking on the first two “Show” buttons shows me the emails sent to
the bcc. They are identical except for the Message-ID:
Message-ID: rt-3.6.7-11790-1225114307-1745.16217-6-0@xxxx.xx.xx
Message-ID: rt-3.6.7-11790-1225114307-1745.16217-7-0@xxxx.xx.xx

The third “Show” shows me the email to the requestor with the
following Message-ID:
Message-ID: rt-3.6.7-11790-1225114307-1745.16217-15-0@xxxx.xx.xx

The other difference is the bcc mails are from the "user name via RT"
and the requestor email is “Queue Name vi RT”.

Have I set up the queues incorrectly?

Thanks for any help.

Regards,
Stefan