@IsoKiero I don't know about "latest and greatest", but your bog-standard solution seems about right; just add radicale into the mix, and you've got calendaring and contacts.

I've been using mailcow for about a year and i am very satisfied, it checks all your boxes and is easy to configure and deploy over docker.

I’ve stuck with iredmail for years. Spin up a VM, grab the installer, and see how it performs for you.

@IsoKiero I'm a happy user of #MailCow for years. It just works, simple to inslall and update. I'm using #CaddyServer as a reverse proxy to further simplify the setup. And it's made in #EU 😄

Check out Mail-in-a-Box

It doesn’t answer your questions about calendar and contacts, but you might still find it interesting to take a look at this project:

maddy.email

I have Dovecot and Postfix running on Debian on a server in my closet. Works great for my needs

You can do calendar and contacts separate from email. Try Radicale. I’ve been using it for years.

I’ve been playing with Stalwart-Email as a combined SMTP/IMAP server. Its open source and written in rust, still pretty early in development and I haven’t played with it enough to give any real opinion on the pluses or minuses compared to other software, but its worth taking a look at.

For self-hosting, be mindful IP addresses have reputation scores and your IP needs to build them up positively. You need to have reverse DNS set, DKIM, SPF records etc for a more trusted reputation, domain reputation etc to not be flagged and sent to spam folders. I just got the $1/month Proton E-Mail for 10 addresses for 1 custom domain as I didn’t feel like dealing with any of this with self hosting, but props for going the self-hosting route.

I’ve been using Poste.io for about 2 years on a vps from Netcup. It has caldav/carddav built in. I also use Radicale and Baikal for caldav/carddav.

I like [nixos-mailserver.readthedocs.io/en/latest/](NixOS Mailserver)

this isn’t addressing the technical side per se, but consider your user’s rebelling factor, i.e. them passively resisting using the stuff you provide and sticking with corpo-crap.

not to go into details, but I’ve got a number of opensource solutions in place for various clients. we have huge some issues with users who need to be corralled and coerced into using the provided messengers, web portals, and such. some resist out of habit, other’s because they prefer the infinitely more polished UX of assorted spyware as opposed to the janky feel and rather rudimental features of opensource alternatives (think gmail vs roundcube).

I have been using modoboa, my installation is fine as far as it goes, but coming up a little short technologically these days, and the upgrade path is total replace. If you have or install Docker on your server, there are poste.io and docker-mailsever,which both look good. Running your mailserver in a container or VM is almost essential, for security, and so you can blow it away and start over if you make a mistake.

Running an email server is not necessarily hard, but it is stressful: if you have other users, even family, they will take it for granted when it works, and complain loudly when it does not. Like any server that others use. But, beyond security, I have a certain stubborn geek machismo about it, it’s a level of sysadmin above basic.

Has anyone here used Mox? It looks interesting, but maybe a little immature.

My stack is postfix, dovecot, slapd for accounts, SoGO for web mail, calendar and task and contact management. Syncs to my phone via davx and just works out of the box. It’s multi domain and my small company even sells hosted email services.

Rspamd for anti spam and dkim. Use a free email testing service to confirm SPF etc are setup correctly.

Also make sure you have regular backups and up to date lets encrypt certificates.

Honestly, what I use is not what I would recommend. ;-) My own setup follows these directions (TL;DR: OpenBSD, as much OOTB OpenBSD software as possible, and Dovecot.)