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Question about x-open-relay

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Question about x-open-relay

I'm getting the following line at the end of all my received email headers:

x-open-relay: 213.228.231.120 is in a black list at list-dsbl-org.dnsbl.plus.net

Please can anyone tell me from where this is originating and what are the consequences?

The IP address refers to a server at BPWeb through whom I redirect mail from a domain that is hosted by them. They (BPWeb) say that this is something PlusNet are doing. DNSBL hasn't listed this server for about five months.

Thanks
Paul