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We started with the packages the Debian maintainers place in their distribution by default. As noted earlier, we need to make some changes—notably, in order to use Postfix. While you might think we're second-guessing the good work of the Debian team, that's not quite the case.
The Debian team has chosen to install, by default, services appropriate for a LAN, such as the Network File System (NFS). But we're putting our server on the Internet, so we'll want to delete NFS and some other services, while adding others such as OpenSSL.