This file is indexed.

/etc/exim4/conf.d/router/mmm_mail4root is in exim4-config 4.76-3ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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### router/mmm_mail4root
#################################
# deliver mail addressed to root to /var/mail/mail as user mail:mail
# if it was not redirected in /etc/aliases or by other means
# Exim cannot deliver as root since 4.24 (FIXED_NEVER_USERS)

mail4root:
  debug_print = "R: mail4root for $local_part@$domain"
  driver = redirect
  domains = +local_domains
  data = /var/mail/mail
  file_transport = address_file
  local_parts = root
  user = mail
  group = mail