nomad

I use sogo for that. Includes a web interface as well as proper authentication mechanisms and sync integration. Is also lightweight and even allows LDAP integration oif you like.

Also caldav support for tasks and events as well as carddav for contacts. Also allows connections to any email account for sharing calendar events and being invited via email.

Its a tradeoff, it’s discussing things with people that understand you and being protected from outside interference while doing so.

Then again this creates a bubble which leads usually to radicalization. Which leads to a lack of respect for otherl peoples experience and point of view.

I wish communities like this would introduce labels to invite outside views or maybe a “male input Monday” or something. Just to stave off the effects of isolation to a specific mindset.