On Thu, Mar 25, 2010 at 03:40:55PM +0000, Jamie Griffin wrote:
> Mar 25 15:04:45 fix postfix/smtpd[11095]: NOQUEUE: reject: RCPT 
> from pih-inmx03.plus.net[212.159.10.4]: 450 4.1.8 
> <www-d...@fhw-workplace02.servers.plus.net>: Sender address 
> rejected: Domain not found; 

fhw-workplace02.servers.plus.net is the domain that does not exist.
The REAL problem that needs to be addressed is that the sender is
trying to use an invalid sender address. These deserve to be
rejected.

That said, recently I did a special order from Lowe's (a big USA
retailer), and they outsourced their order service to some silly
company which did not understand this VERY BASIC issue in email.
(That company is called "IBM".)

Since I needed the order, I had to whitelist, ugh. It was very
painful, thinking of how much money Lowe's pays IBM for that fine
service, and me being in need of a job. :)

> So i tried letting this domain through by putting .plus.net into a 
> file:

You need to understand the documentation of
parent_domain_matches_subdomains. Unfortunately, I don't know enough
to explain it to you. :) But I'm fairly sure in your case that the
leading dot pattern was not looked up. I unset this:
    parent_domain_matches_subdomains =
so, for me, something similar (with ihost.com) is what worked.

>     hash:/usr/pkg/etc/postfix/whitelist_sender 
> 
>   like so: 
>        /usr/pkg/etc/postfix/main.cf :
>        smtpd_sender_restrictions = 
> check_sender_access hash:/usr/pkg/etc/postfix/whitelist_sender,
>         [ ... ]
> 
>        /usr/pkg/etc/postfix/whitelist_sender:
>        .plus.net        OK

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