This file is indexed.

/etc/pam.d/esmtp is in courier-mta 0.76.3-5+deb9u1.

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 configuration file for Courier IMAP daemon

@include common-auth
@include common-account
@include common-password
@include common-session