if its "home", and you really must run your own, axigen has a free version for up to 100 users. hmail would work if you're on windows but it doesnt come with we

if its "home", and you really must run your own, axigen has a free version for up to 100 users. hmail would work if you're on windows but it doesnt come with webmail. or just install virtualmin and use virtualmin to add whatever domain you need...and setup roundcube/squirrel from virtualmin too... all easier than rolling your own postfix+dovecot..despite linode writing excellent guides for that.. finally, rack mounted stuff would be too noisy to be let into a home.. since its a 'home' mail server, there'd be barely any load.. you can probably add it to your existing htpc or something without issue...