You use /sbin/e-smith/dynamic-dns/custom
Mine is like this (domain name edited):
#!/bin/sh
# Description: Put your description here
#------------------------------------------------------------
# Custom dynamic DNS update handler.
#------------------------------------------------------------
IPADDR=$1
USERID=$2
PASSWD=$3
DOMAIN=$4
#------------------------------------------------------------
# Your handler starts here.
#------------------------------------------------------------
wget -O - --http-user=$USERID --http-passwd=$PASSWD '
http://dynamic.zoneedit.com/auth/dynamic.html?host=www.domainname.com'
wget -O - --http-user=$USERID --http-passwd=$PASSWD '
http://dynamic.zoneedit.com/auth/dynamic.html?host=mail.domainname.com'
#------------------------------------------------------------
# Your handler ends here.
#------------------------------------------------------------
exit 0
That's it - works really well.
Des Dougan