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[LUG] Mail- relay not permitted?

 

Since yesterday all my mail is coming back with 550 relay not permitted, even though the server replying is the final destination. This includes the dclug server.

It seems like I'm on a spam blacklist or something, but I'm not listed on any of the searches I've tried. What search system should I use for this anyway?

I'm sending mail directly from postfix on my server, ip 91.84.130.145. It was working fine until yesterday and I haven't changed anything.

Ideas anyone?
Thanks
Simon
--- Begin Message ---
This is the mail system at host proxima.systemparadox.co.uk.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<list@xxxxxxxxxxxxx>: host dcglug.org.uk[212.24.80.6] said: 550 relay not
    permitted (in reply to RCPT TO command)
Reporting-MTA: dns; proxima.systemparadox.co.uk
X-Postfix-Queue-ID: 659E37F8F2
X-Postfix-Sender: rfc822; simon@systemparadox.co.uk
Arrival-Date: Fri, 27 Jul 2007 14:32:44 +0000 (UTC)

Final-Recipient: rfc822; list@dcglug.org.uk
Original-Recipient: rfc822;list@dcglug.org.uk
Action: failed
Status: 5.0.0
Remote-MTA: dns; dcglug.org.uk
Diagnostic-Code: smtp; 550 relay not permitted
--- Begin Message ---
Paul Sutton wrote:
Happy system admin day

You what?

--- End Message ---

--- End Message ---
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