[exim] log_selector and SMTP authentication

[Luciano Rinetti]

   I'd like to log the SMTP crdentials used by users in order to access my
   Exim4 SMTP Server.
   I try to add the "+smtp_mailauth" in the log_selector of the Exim4
   config file
   but i am not sure this is the correct way.
   Thank you for any help.
   Regards,
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