This file is indexed.

/etc/pam.d/smtp is in sendmail-base 8.14.4-4+deb7u1.

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

The actual contents of the file can be viewed below.

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#%PAM-1.0
#------------------------------------------------------------------------
#
# /etc/pam.d/smtp
#
# Copyright (c) 2000-2003 Richard Nelson.  All Rights Reserved.
# Version:    2.0.1
# Time-stamp: <2003/05/06 12:00:00 cowboy>
#
# PAM configuration file used by SASL to authenticate a PLAIN password.
#
#------------------------------------------------------------------------
@include common-auth
@include common-account
#@include common-password