Could someone explain what this does?
I found it at http://www.delouw.ch/linux/Postfix-Cyrus-Web-cyradm-HOWTO/html/cyrus-config.html


Does it create a self signed certificate?
Is there an easier way on Debian?

*Creating the TLS/SSL Certificate*

If you want to enable Cyrus' TLS/SSL facilities, you have to create a certificate 
first. This requires an OpenSSL installation

openssl req -new -nodes -out req.pem -keyout key.pem openssl rsa -in key.pem -out new.key.pem
openssl x509 -in req.pem -out ca-cert -req \
-signkey new.key.pem -days 999


mkdir /var/imap

cp new.key.pem /var/imap/server.pem
rm new.key.pem
cat ca-cert >> /var/imap/server.pem

chown cyrus:mail /var/imap/server.pem
chmod 600 /var/imap/server.pem # Your key should be protected

echo tls_ca_file: /var/imap/server.pem >> /etc/imapd.conf
echo tls_cert_file: /var/imap/server.pem >> /etc/imapd.conf
echo tls_key_file: /var/imap/server.pem >> /etc/imapd.conf


Thanks,
Jacob
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