[Exim] trusted users syntax

Can the main configuration option "trusted_users" take numeric uid's rather than
usernames?

My system uses NIS for the passwd file and under very heavy load conditions it
appears to fail to get a successful result (despite having "finduser_retries" set to
10). I have tried to get the configuration to cope by having a router which causes
a defer if the previous router with "check_local_user" fails, but if the lookup for
"trusted_users" fails then exim panics. If I could use UIDs instead I hope it would
prevent the panics.

Phil.
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Phil Chambers (postmaster@???)
University of Exeter