One of our customers experiences an annoying problem. Email sent to internet addresses with a CC to an internal address show userid.po.domain@domain.nl for the internal recipient. E.g. CC: <admin.gwpo.gwdom@domain.nl>

I have checked all settings for internet addressing, addressing rules and the ari, aql and aqor settings in gwia.cfg but none of the combinations make the problem disappear.

What can I do to get rid of these wrong addresses?