Running a Confidant Mail server is easier than running an SMTP server. You will need:

Confidant Mail supports two-way replication. If you want to run a business network or a commercial service provider, you should have two machines which do not share any common power or network infrastructure. One can be an internal server and the other a virtual machine from a cloud-hosting provider.

Even if you only intend to set up a single server now, you should configure two DNS A records pointing to the same IP address. If you later want to convert to a replicated configuration, you can do so just by changing one of the A records, without any client-side changes. If you only configure a single A record, you will have to reconfigure all of your clients when you want to set up replication.

To add a replication peer to an existing single server: