This file is indexed.

/usr/share/dovecot/conf.d/auth-deny.conf.ext is in dovecot-core 1:2.0.19-0ubuntu2.1.

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

The actual contents of the file can be viewed below.

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# Deny access for users. Included from auth.conf.

# Users can be (temporarily) disabled by adding a passdb with deny=yes.
# If the user is found from that database, authentication will fail.
# The deny passdb should always be specified before others, so it gets
# checked first.

# Example deny passdb using passwd-file. You can use any passdb though.
passdb {
  driver = passwd-file
  deny = yes

  # File contains a list of usernames, one per line
  args = /etc/dovecot/deny-users
}