Your incoming mail relay server, mrouterin.brutele.be[212.68.193.7],
is *systematically* answering
554 Mail from XXX.YYY.ZZZ.TTT refused, see RBL server sb.spamcop.net
This was also tested with an open relay server test web-page in the US
and from non-mail-relaying hosts in our own network.
None of the client systems used is on a Spamcop or any other blacklist.
Eric.

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