We are migrating from a clearswift solution to Cisco ESA. We are trying to export the existing smime public keys and add them to ESA, but every key one by one. The export button hides once you select more than one key. With ober thousands, a mess.
Does someone already dealt with that and knows about mass exporting the keys?
openssl x509 -inform DER -in Placeholder.DER -out Placeholder.pem
Please keep in mind that this way helps if you only need to import a few public keys. In larger deployments you may need to build a script and upload data to ESA in a single file. Or make sure you never use ESA for de/encypting mails.