Title: Fix possible failed notifications running in docker environment
Class: fix
Compatible: compat
Component: notifications
Date: 1695386294
Edition: cre
Knowledge: doc
Level: 1
State: unknown
Version: 2.2.0p11
Werk #15941 already fixed failed notifications on appliances if one recipient had
no Email address configured.
We have now seen the same behaviour when running Checkmk in a docker container
because Nullmailer can not handle such recipients.