2009/10/3 Jon L. Miller <jlmil...@mmtnetworks.com.au>:
>  NOQUEUE: reject: RCPT from unknown[203.153.242.20]: 450 4.1.1 <yvo...@p
> cp.org.au>: Recipient address rejected: User unknown in local recipient
> table; from=<ad...@qcp.org.au> to=<yvonne
> @pcp.org.au> proto=ESMTP helo=<pmx.mmtnetworks.com.au>
>
> As I happen to know the users at pcp.org.au the user yvonne does not have
> an address, so she wouldn't be in the local recipient table.
> What I want to know is why it states "RCPT from unknown[203.153.242.20]"
> when the ip address is the mail server.  I would have guessed that the
> domain name would be between the [ ].

If memory serves, I think "unknown" just means that it couldn't get a
verified DNS name. Postfix attempts to check IP->name (PTR record) and
then name->IP (A record) to see if it matches.

> I've seen this regarding other users and these users are vaild user and
> the mail does not get through.

This is a different problem.

> Sep 30 21:31:37 mail postfix/smtpd[1242]: NOQUEUE: reject: RCPT from
> unknown[203.153.242.20]: 554 5.7.1 <li...@ii
> net.net.au>: Relay access denied; from=<> to=<li...@iinet.net.au>
> proto=ESMTP helo=<pmx.mmtnetworks.com.au>
> Sep 30 21:31:37 mail postfix/smtpd[1242]: disconnect from
> unknown[203.153.242.20]
>
> This user is trying to send mail to a user on another domain that we look
> after. It's stating relay access denied, the domain this mail is trying to
> get to is in the transport map and the relay_domain command in main.cf

Do you look after iinet.net.au? I have my doubts, but that's not
really relevant right now. Relay access denied generally means that
postfix doesn't think it should be handling mail for that
domain/address, AND the client isn't get a free pass (eg. by being
localhost).

That changes if you've specified iinet.net.au as a relay_domain, but
when you do this, you also need to setup relay_recipient_maps
(http://www.postfix.org/postconf.5.html#relay_recipient_maps). If
you've done that and it's still not working then you'll need to show
us the output of `postconf -n`, and ideally the contents of your
relay_domains map.

As a note, adding iinet.net.au to your transport_maps won't be that
helpful, unless you have a specific path in mind that doesn't involve
sending mail to their designated MXes.

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