We have a redhat mail server with an SSL cert that us due for renewal. I've done renewals for IIS web servers but I've never done one for a Linux mail server. I know where the pem files and mail config are located. What I'm not sure about is submitting the generated csr to geotrust for the renewal. Since we have a csr already generated from the first time we purchased the cert, can I just resubmit that csr file or do I need to generate a new csr? Its the exact same mail server and domain name. If I do need to generate a new csr how do I go about doing that on redhat.
This is related to an earlier question that was answered, but I forgot about the csr submission piece