This file is indexed.

/etc/courier/module.esmtp is in courier-mta 0.66.1-1ubuntu4.

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

The actual contents of the file can be viewed below.

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NAME=esmtp
PRIORITY=50
PROG=./courieresmtp
MAXDELS=40
MAXHOST=4
MAXRCPT=100