zimbra zmdkimkeyutil version that import key so you can use the same key on your spare server to import a key, do a zmdkimkeyutil -q -d domain.ex on original server put key in /tmp/privkey, put publickey in /tmp/public and note selector zmdkimkeyutil.import -i -d domain.ex -s selector1 -k /tmp/privkey -p /tmp/public
use at your own risk, this script is a hack, it dosn't verifiy if key or public signature is valid.