No their SPF config works as they want it.  I think perhaps mentioning
SPF was a red herring, what I really want to know is how I can have a
distribution list in a Postfix Virtual Domain that sends with the
envelope (if that's the term) set to something we control and not using
the senders domain/email address *whilst still* making it clear at MUA
level that the original sender is the sender.

-----Original Message-----
From: owner-postfix-us...@postfix.org
[mailto:owner-postfix-us...@postfix.org] On Behalf Of Simon Waters
Sent: 20 August 2009 10:20
To: postfix-users@postfix.org
Subject: Re: Distribution lists/SPF with Postfix?

On Thursday 20 August 2009 10:01:37 Paul Hutchings wrote:
> We have a basic distribution list setup within postfix under a virtual
> domain.
>
> One of the external parties who wants to sent to it has an SPF record
in
> place so of course in its current configuration the message is being
> rejected by our SPF,

If they aren't a permitted sender don't accept it, their SPF config is 
presumably broken?

> and of course even if we allowed it, it would be 
> rejected by the SPF of the recipients mail servers.

If you are setting the envelope sender as this domain, then get your
server 
added to their SPF record is probably the appropriate thing to do.

> At present the message would come directly from sender <at>
> theirdomain.com.
>
> Is there a way within Postfix to have it originate from "distribution
> list <at> ourdomain.com on behalf of sender <at> theirdomain.com" or
> would I need third party listserv software to do this?

You are confusing envelope sender and headers.

I think SPF is broken by design, but if you aren't rewriting the email,
then 
yes mailing list software will do that for you.

I've tended to regard SPF errors as self inflicted injuries.

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