Im about to upgrade to a new Exim release. Do I need to ensure the spool is empty, or take any other special action?
A0105: If you are changing to release 3.00 or later from a release prior to 3.00, you will probably need to make changes to the runtime configuration file. See README.UPDATING for details. Otherwise, you do not need to take special action. New releases are made backwards compatible with old spool files and “hints” databases so that upgrading can be done on a running system. All that should be necessary is to install a new binary and then HUP the daemon if you are running one.