[exim] Config: "trusted_users" critical?

Hi.

Thanks to everyone who helped me with previous questions.

I am currently reviewing my exim4.conf file for possible security
holes, in order to prevent potential spammers from taking over my box
again.

Is the "trusted_users" option a possible security gap, and what
critical functionality would I be losing, if I left this option empty, ie.
trusted_users
(incidentally, would that be a legal notation for this option)?

TIA,
Joseph



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