I've been getting the error for over a week, with any messages I try to send to through exim. My service provider blames Netvision, however sending works fine through other mail providers.
As the end user, I don't need to fix this, my ISP does - but as things often are, nothing will happen without some moving & shaking. Is this a matter of cleaning up exim's records, or could it indeed be the receiving server? Does Time Warner (socal.res.rr.com, see below) have anything to do with it?
Why is there no (SMTP) error code for the delivery failure?
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