We have a Win2k3 server with IIS6 SMTP installed and configured. We only need inbound mail for this, which is working fine at the moment for testing, but there's no encryption configured at this time. When it goes to production, the sending servers from the Net will all use TLS to encrypt the traffic.
We do have a wildcard cert from a 3rd party for *.domain.com but I can't seem to import it into the SMTP properties. I have imported the crt file onto the server, but nothing shows up when I go through the IIS Certificate Wizard.
Is there something else I can try or do I need a new cert? If so, can I use one from an internal CA or would it need to be from a 3rd party?