I use Radicale with iOS and iPadOS devices and multiple users.
34 karma · joined February 10, 2017
In-bound is easy with DNS checks filtering all spam. Out-bound is somewhat out of my control, so I use a relay like smtp2go or sendgrid for reliable delivery.
https://www.marinetraffic.com/ais/details/ships/mmsi:3669720...
A clean install and profile, no add-ons, and google.com/maps (for example) will max out my cpu. There must be some bug related to old hardware and OS (Macbook Pro 2009 + 10.11.x) or more people would be experiencing this.