Vdirsyncer
Once you have self-hosted email up and running, you may want to add the Calendar and Addressbook features to your service bag. Nowadays, the standard protocols regarding those subjects are CalDAV and CardDAV.
I decided to go with Baikal , the dedicated CalDAV+CardDAV server based on the sabre/dav framework ; the same framework used in Nextcloud DAV services AFAIK.
It relies on PHP and is available as a package on OpenBSD.Continue reading...