I want to set up an email server which will only send and receive emails within my local network.
Maybe a few emails per day between about three or four people.
I see a number of email server guides posted here, but they all seem like overkill. Any advice?
If I don't open up any ports and don't link to a commercial server, so I have to deal with all the security items?
(I was hoping that Gmail allowed to block unknown senders and receivers, but it doesn't do what I needed to do. Is there another free service which would do so?)