Adding a Bcc in a send-hook

["Matthew R. Dempsky" <mrd@xxxxxxxxxxx>]

I'd like to setup mutt to set a ``Bcc: mrd033000@xxxxxxxxxxxx'' header
field whenever I address email to ``$foo@xxxxxxxxxxxx'' (except when
foo=utdlug).  Right now I have the following line in my .muttrc:

    send-hook '~t @utdallas\.edu$ !~t ^utdlug@utdallas\.edu$' 'my_hdr "From: 
matthew.dempsky@xxxxxxxxxxxxxxxxxxxx" ; my_hdr "Bcc: mrd033000@xxxxxxxxxxxx"'

The default From field is set as I'd like, but Bcc is not.

Is there another way to achieve the desired effect (i.e., routing an
extra copy of the email to my utdallas.edu mailbox so I can be
informed when their spam filtering software decides to trash my
messages)?

(In case it's relevant, I'm using mutt 1.5.12-hcache from OpenBSD 4.0.)

Thanks.