The instructions for installing postgrey would appear to be very simple but I get 451 errors for everybody that tries to send us an e-mail. I've had it working on my home system with a bog standard postfix/dovecot installation so I don't think I'm completely hopeless.
I have Ubuntu 8.04LTS and Zimbra 5.0.13 installed.
The typical errors in /var/log/mail.log are along the lines of ...
NOQUEUE: reject: RCPT from remote.server[ip address]:451 4.3.5 Server configuration error; from=
I have tried a few times now and upset everyone by having to restart zimbra after removing it.
Does anyone have any suggestions or could offer some help?