[exim] Delivery to root

I have the following routers defined:

postmaster_alias:
driver = redirect
domains = +local_domains
condition = ${if eq{$local_part}{postmaster}{1}{0}}
data = root

bounce_copies:
driver = redirect
domains = +local_domains
senders = :
data = root
unseen

Root is aliased to a real address. Both of the routers work, but the second
one writes a line to the panic log that says "User 0 set for local_delivery
transport is on the never_users list".

I can understand the reasons for the error message, and I could get round it
by specifying a real address, but why doesn't the first router produce the
same error?


Mark