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Creating the directories vm3 needs for the commands to work.
# Let's start by generating a new certificate for Dovecot on your vm3 machine by issuing the following commands:
<source lang="bash">mkdir /etc/ssl/{private,certs}openssl genrsa -des3 -out vm3.andrewsmith.org.key 2048
chmod 600 vm3.andrewsmith.org.key
openssl req -new -key vm3.andrewsmith.org.key -out vm3.andrewsmith.org.csr
openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem -days 3650
chmod 600 vm3.andrewsmith.org.key cakey.pem
cp vm3.andrewsmith.org.key cakey.pem /etc/ssl/private/cp vm3.andrewsmith.org.crt cacert.pem /etc/ssl/certs/</source>
::'''NOTE:''' This process is identical to what you've done for the vm2 certificate. In fact if your IMAP and SMTP servers are on the same machine (i.e. you can share the certificate between them). In our case, they are not on the same machine.
