Thats what i get when sending from gmail account and it doesn't get delivered, I get a 'Undelivered' reply on gmail, i tested with 10 sent emails, and everytime the same.
Code:
Nov 8 12:13:11 mail postfix/smtpd[9215]: connect from wa-out-1112.google.com[209.85.146.176]
Nov 8 12:13:12 mail postfix/smtpd[9215]: NOQUEUE: reject: RCPT from wa-out-1112.google.com[209.85.146.176]: 554 Service unavailable; Client host [209.85.146.176] blocked using zen.spamhouse.org; This is not the DNSBL you're looking for.; from=<my_email> to=<my_other_email> proto=ESMTP helo=<wa-out-1112.google.com>
"This is not the DNSBL you're looking for"
What would that mean? It looks like its misconfigured somehow, but i have no idea how.
edit: 20090602: changed email address, i smell spambots around.