Lets assume that you already have a working ssl for plesk URL
vi /etc/courier-imap/imapd-ssl
Edit
TLS_CERTFILE=/usr/share/imapd.pem
Now open
vi /etc/postfix/main.cf
Edit
smtpd_tls_cert_file = /etc/postfix/postfix_default.pem
Now Open the file
vi /etc/courier-imap/pop3d-ssl
Edit
TLS_CERTFILE=/usr/share/pop3d.pem
Now copy
cp /usr/local/psa/admin/conf/httpsd.pem /usr/share/imapd.pem
and
cp /usr/local/psa/admin/conf/httpsd.pem /etc/postfix/postfix_default.pem
and
cp /usr/local/psa/admin/conf/httpsd.pem /usr/share/pop3d.pem
Now restart courier-imap and postfix
/etc/init.d/courier-imapd restart && /etc/init.d/postfix restart
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