Seconding for mailu. I've had a mailu server running for at least a couple of years that requires very little on-going maintenance, but I don't use it daily or

Seconding for mailu. I've had a mailu server running for at least a couple of years that requires very little on-going maintenance, but I don't use it daily or for anything personally mission critical. When I do need it, however, it's there, humming away happily.