/etc/courier/module.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.
1 2 3 4 5 6 | NAME=esmtp
PRIORITY=50
PROG=./courieresmtp
MAXDELS=40
MAXHOST=4
MAXRCPT=100
|