Show us config show horde without the DBPassword entry and config show imp.
config show horde:
access=full
freebusy=enabled
imp=installed
status=enabled
config show imp
imp=service
access=full
status=enabled
Ok, so you have the horde addons installed as well. That would have been good information to know as well as knowing what it was, you were trying to do. If you have the most up to date horde rpms installed, then the custom template for adding admin as a horde admin is no longer needed. I don't think this was mentioned in any of the 7.x announcements.
rpm -qil e-smith-horde --changelog | more
will show you when it was added. Please remove that custom-template and do:
config setprop horde Administration enabled
signal-event email-update
Are you also accessing webmail via http and not https? My access lines say SSL not full?
John