Seeing double

I’m having problems with rt 2.0.13 sending duplicate mails with double headers.

Example:

X-RT-Loop-Prevention: dept-lawr.ucdavis.edu
X-RT-Loop-Prevention: dept-lawr.ucdavis.edu
In-Reply-To: rt-56@dept-lawr.ucdavis.edu
In-Reply-To: rt-56@dept-lawr.ucdavis.edu
Managed-BY: Request Tracker 2.0.13 (http://www.fsck.com/projects/rt/)
Managed-BY: Request Tracker 2.0.13 (http://www.fsck.com/projects/rt/)
RT-Ticket: dept-lawr.ucdavis.edu #56
RT-Ticket: dept-lawr.ucdavis.edu #56
X-Mailer: Perl5 Mail::Internet v1.45
X-Mailer: Perl5 Mail::Internet v1.45
Precedence: bulk
Precedence: bulk
RT-Originator:
RT-Originator:

My mail system is qmail, and I am using sendmail pipe with “-oi -t” as my
arguments. Does anyone have any suggestions as to what might be wrong? Would
any other information be helpful in resolving the problem?

Thanks,
Richard