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Postfix StartSSL

generate certificate request

mkdir -p /root/ssl
cd /root/ssl
openssl req -new -newkey rsa:4096 -nodes -keyout mail.nindl.net.key -out mail.nindl.net.csr

Download the StartSSL Bundle

wget https://www.startssl.com/certs/ca-bundle.pem -O startssl-ca-bundle.pem
cat ca-bundle.crt > /etc/ssl/certs/ca-bundle.crt