On Sun, Feb 01, 2009 at 04:30:49PM -0800, Daniel Burrows <dburrows@debian.org> was heard to say:
> $ aptitude search '?depends(mail-transport-agent)'
Sorry, that should be
$ aptitude search '?installed?depends(?name(^mail-transport-agent$))'
to restrict it to installed packages and to make extra-sure nothing
else sneaks in.
Daniel