I don't think you'd want to run slocal from your sendmail.cf file
because slocal throws away error messages from the commands it runs.
Even slocal -verbose will only tell you if a command it runs (like
rcvpack) "wins" or "loses". Also, when the actions in .maildelivery
fail and slocal falls back on its other defaults, you won't hear
much about what's happening.
I'm no sendmail guru, but one problem you might have running rcvpack
from sendmail.cf is that rcvpack wants to read an MH profile file.
You'd have to spoof rcvpack to ignore the user's MH profile (by
setting the MH envariable, maybe).
Also, rcvpack adds a "Delivery-Date:" header to messages.
You could hack rcvpack.c to stop that, though.
--
Jerry Peek, O'Reilly & Associates, jerry(_at_)ora(_dot_)com, (617)354-5800