This file is indexed.

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

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The actual contents of the file can be viewed below.

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# Authentication for SQL users. Included from auth.conf.
#
# <doc/wiki/AuthDatabase.SQL.txt>

passdb {
  driver = sql

  # Path for SQL configuration file, see example-config/dovecot-sql.conf.ext
  args = /etc/dovecot/dovecot-sql.conf.ext
}

# "prefetch" user database means that the passdb already provided the
# needed information and there's no need to do a separate userdb lookup.
# <doc/wiki/UserDatabase.Prefetch.txt>
#userdb {
#  driver = prefetch
#}

userdb {
  driver = sql
  args = /etc/dovecot/dovecot-sql.conf.ext
}

# If you don't have any user-specific settings, you can avoid the user_query
# by using userdb static instead of userdb sql, for example:
# <doc/wiki/UserDatabase.Static.txt>
#userdb {
  #driver = static
  #args = uid=vmail gid=vmail home=/var/vmail/%u
#}