scripts/domain-check by Matty (http://www.cyberciti.biz/files/scripts/domain-check-2.txt)
# Checks DNS A record $1 on server $2
# Returns exit code of host(1) command: 0 - Ok, 1 - error
# (Hint: define value map for 0, 1)
UserParameter=host[*],host -W 3 $1 $2 > /dev/null; echo $?