Add role for customer-specific mail server with greylisting, virus scanner and SpamAssassin (#10182).
Unify user ids for system services that used to be dynamically generated on a per-system basis. This may cause nginx (web server) downtime in some cases (#10182).
Improve NTP clock stability.
Fix bug in
/etc/resolv.confhandling that caused delays during VM bootstrap.
Sharpen mail server monitoring to test spam rejection etc. (#10182).
Add ssh-forward tutorial.
Add Mail server role documentation.
Improve access-nagios tutorial.