> > > forward(5) of a_user (that's the one tried first)
> > > |/usr/local/bin/procmail
> > >
> > > after that delivery to b_user is not attempted.
> >
> > THis is relevant to my previous post: why is procmail
> > failing here in the first place? I find that procmail
> > always fails for me without the -f option.
> >
>
> No idea, maybe procmail is still running and waiting for something
> to quit ? Can you check for the procmail process with top ?
What happens is that procmail actually does append the message to the
appropriate mailbox, but without the leading 'From ' line.
(And apparently, it exits with a nonzero status, thus disturbing smtpd,
which was the OP's problem as I understood it.)
Jan