Thank you for your replies. I investigate further and found that it
was a Postfix error in configuration. Though I don't understand if
BATV was truly playing a part in it, the server was rejecting
unverified senders, but there wasn't a hash map to indicate verified
senders. I have fixed this.

I based my findings from my search for "prvs=" in Google.

On Wed, Sep 22, 2010 at 8:47 PM, Brad Knowles <[email protected]> wrote:
> On Sep 22, 2010, at 12:02 PM, Christopher Adams wrote:
>
>> I have had a couple of list subscribers fail to post message to their
>> lists. I tracked down the logs and this seems to be the common theme.
>> I Googled prvs= and found info on BATV. Does Mailman not play well
>> with this or am I not quite understanding what this means?
>
> For those who are not familiar with this term, they should see the Wikipedia 
> page at <http://en.wikipedia.org/wiki/Bounce_Address_Tag_Validation>.
>
> Suffice it to say that BATV has more than a few problems.  I proposed an 
> alternative that I called Bounce Address Fingerprint Validation which would 
> achieve the same goals but doesn't actually do munging of the Envelope Sender 
> address, but that ran into more than a little resistance from the supporters 
> of BATV.
>
> And when combined with things like VERP, it can really screw things up.
>
>> <[email protected]>: Sender address rejected:
>> undeliverable address: host senders.mailserver.com[xxx.xx.xxx.xx]
>> said: 550 5.1.1
>
> I think some critical information is being lost here.  We need to see the 
> entire error message being generated, and we need to know more information 
> about how this system relates to the Mailman installation, etc....
>
> --
> Brad Knowles <[email protected]>
> LinkedIn Profile: <http://tinyurl.com/y8kpxu>
>
>



-- 
Christopher Adams
[email protected]
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