At some point in the future, we would love to offer better tools and integrations for Mailpile that make the email server component easier to integrate with. But, doing this the right way that doesn't compromise security or ethics takes time to create. Until that point in the future, if you're handy with the command line, you might want to consider setting up a mail server using one of the following open source projects. Each options has the goal of making self hosting an email server much easier.