In
/sbin/e-smith/dynamic-dns/dyndns.org
find the line that starts with wget and change
system="dyndns" to system="custom" and
wildcard="on" to wildcard="off"
This implies, that the domain name you want to update, is the same as the one you use internally. If this is'nt the case place the following line before the wget command:
DOMAIN="domain2update.tld"