nomad

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.

Organic maps on fdroid. Data from osmand but without the learning curve.

Modular solution. Big NAS for backup and file and media serving shuts down when I go to bed automatically or nobody is home. Boots via WOL when needed.

Always on services on a central pi for home automation, phone and internet services, etc.

I’m surprised nobody here mentioned SoGO. It’s a fully featured web mail interface that integrates contact management and a web calendar including caldav, carddav and task support. Easy up setup and easy to connect to any phone via foss apps.

I use SoGo for that.

Cal and task sync. Card dav, Email und calendar in one neat web interface

Jup, freecad sucks balls, but there is nothing better. Opescad is nice if you are used to coding.

Build your own ISP :)