/etc/courier/esmtpd.cnf is in courier-mta 0.78.0-2ubuntu2.
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 7 8 9 | organization = "Courier Mail Server"
unit = "Automatically-generated ESMTP SSL key"
locality = "New York"
state = "NY"
country = US
cn = "localhost"
serial = 001
expiration_days = 365
email = "postmaster@example.com"
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