text_combined: jonathan dill qcovkbaqnerdsnet james parra wrote postfix log says following feb 8 122104 postserver postfixsmtpd22189 warning 6422240195 address listed hostname nsky3com feb 8 122105 postserver postfixsmtpd22189 noqueue reject rcpt unknown6422240195 504 helo command rejected need fullyqualified hostname protoesmtp helo server identifies nsky3com dns resolves nsky3com 20818322488 turn resolves cmscacheclickabilitycom nsky3com address 20818422488 88224184208inaddrarpa domain name pointer cmscacheclickabilitycom shoes would tell problem end fix dns entry helo server moment break server accommodate people configured things wrong asking trouble ways may anticipate add maincf allow ip address domain access many thanks advance james tue 05 aug 2008 190443 0500 server rejecting mail single domain