I have been running a Zimbra mail server for years and it's been great. Everything is included, configuration is quick and easy and there's lots of documentatio

I have been running a Zimbra mail server for years and it's been great. Everything is included, configuration is quick and easy and there's lots of documentation online. The only negatives are that upgrading is a pain (I have to spin up a whole new server and migrate everything with Zextras Migration Suite) and the whole thing takes up quite some resources.