[exim] mailnull used by Exim

Hi everyone,

The user mailnull used by Exim for running scripts was not found, what are
other appropriate users to run permissions to execute scripts for Exim.

auth_transport:
driver = pipe
command = /public_html/tokens/get_access_token.sh
current_directory = /public_html/tokens
user = mailnull # Replace with the user account used by Exim for running
scripts
group = mail # Replace with the group account used by Exim for running
scripts
--
Regards,
Hal

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