[ajosh]

I'm self hosting with mail-in-a-box as well. It comes with a nextcloud install. It hasn't been flawless but it's been good and I'm happy to have some control.

With e-mail, I haven't had any problems with one exception. When e-mailing the local school system, they reject my e-mails. I looked into it and it turns out that their spam provider was blocking me because I was a private domain or something like that. It was a configuration on their side. Their tech support told me that I should "get an e-mail address with a normal extension."

Outside of that issue, my e-mails have gotten delivered. Between graylisting and the built-in spam filter software, I haven't had any spam issues. It's been smooth as far as that goes. The webmail (roundcube) isn't as nice as gmail but desktop and mobile clients are good in any event.

The mail-in-a-box nextcloud install does use sqlite which means that you should make sure to backup contacts in case sqlite breaks. It broke for me once but I was able to copy my contacts from Thunderbird back into the system without any real problems.

Calendaring works pretty well with Nextcloud but I haven't found any calendar software that I really love. The web software is good but not super fast. Lightning has gotten better but still feels bolted on. Kontact calendar is too groupware-oriented for my personal use. Evolution never quite felt right to me. The built-in Apple calendar and Samsung (Andriod) calendar apps work fairly well.