If it's that few users, have you thought about a low cost hosted server like Digital Ocean? You could probably get away with their smallest server which is $5/mth.

You could also setup a Google Apps account with a custom domain for $5/mth/user ($50/year).

On Tue, Aug 11, 2015 at 12:56 PM, Jonathan Hutchins <hutchins@tarcanfel.org> wrote:

Looking for suggestions on strategy for personal mail. I'm currently
piggybacked on a client with a hosted VM that's been working well for
years, but he's going to managed hosting and I'm loosing the server. I
don't want to rent a VM for three people's personal mail.

I can run a mail server on my home server, but RDNS and Residential
blacklists would make it hard to send mail.
My ISP (Google) doesn't offer relays.

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