Zimbra is the defecto mail solution for an integrated (mail calendar chat) solution. Horde is still the best solution for something completely FOSS. Outside of

Zimbra is the defecto mail solution for an integrated (mail calendar chat) solution. Horde is still the best solution for something completely FOSS. Outside of that there’s mailu which feels like a bunch of services flying in unison.. kinda like an old GM. All of this to say it’s not worth hosting your email because your smtp server doesn’t have any reputation. I had a mail server that never sent spam or junk mail, was online for over 8 years on the same IP and I still had emails blocked or black holed. Not to mention all of your mail will just go to spam the first few times. Very unprofessional and not worth it in my mind.