[Exim] [Exim ] Authorization problem

Hi all !
I'm a new in Exim MTA. So I use exim-4.24
I have some problems with user authorization ...
I need users always to have authorization e.g. as a public
email server
I found some tips in exim html help but it seems did help me
:(
I would be appreciate if someone would give me some parts of
working
config file
Thanx !
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