Shell Command function ignores $SHELL

[Aleksey Tsalolikhin]

Hi,

  Is it me or does the Shell Command function use /bin/sh
to execute commands regardless of the value of my SHELL 
variable?

  For example, I start mutt with

SHELL=/usr/local/bin/zsh  mutt

and then run !ps -p $$

and it shows "sh".

  Am I doing something wrong?  I'd like to be able access
my shell aliases from mutt via !.

Yours truly,
-at