[exim] SMTP AUTH with system users

Hi,

I would like system users to AUTH SMTP with their login/passwords.
For the moment they use one login/password, system wide.

What is the relevant option to set into the exim.conf?
It's about Exim 4.50+

Thank you.

PS: Later, within 5 or 6 months these system users will be LDAP stored
(not /etc/passwd anymore). Are the options different?

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