[Exim] Failing procmail and continue processing

Is there any way to make a failed delivery by procmail (and in fact any pipe
transport) not freeze the message to try again later but to continue
processing the message using the next transport. at the moment I'm giving
out error code 1 from a procmail rc file. Basically I want to do this so I
can have user local rc files but if they don't deliver the message I want it
to do the default system wide attempt at delivering mail (this does not just
mean real-localuser@???)
Any ideas?
TIA
Matthew Bell
matthew@???