What if he does 

1) MX for somedomain.com pointing at his machine
2) Put 
somedomain.com:joe-local
in virtualdomains
3)For each local user bob, create

cat ~joe/.qmail-local-bob
&bob

4) create ~joe/.qmail-local-default
|forward $DEFAULT@ME

(and disregard my previous silly suggestion)

Mate

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