/etc/courier/esmtpd.cnf is in courier-mta 0.68.2-1ubuntu7.
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 10 11 12 13 14 15 16 17 18 19 20 21 22 | RANDFILE = /usr/lib/courier/esmtpd.rand
[ req ]
default_bits = 1024
encrypt_key = yes
distinguished_name = req_dn
x509_extensions = cert_type
prompt = no
default_md = sha1
[ req_dn ]
C=US
ST=NY
L=New York
O=Courier Mail Server
OU=Automatically-generated ESMTP STARTTLS key
CN=localhost
emailAddress=postmaster@example.com
[ cert_type ]
nsCertType = server
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