Please deactivate your #spamcop blacklist filtering. The domain has died temporarily and MTAs are currently rejecting all of your incoming maills.
https://www.golem.de/news/spamfilter-e-mail-zustellungsfehler-durch-abgelaufene-spamcop-domain-2101-153801.html
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deactivate them temporarily, that is... Cisco (who is driving SpamCop) has started recovering the DNS domain, but not all DNS servers know about this, yet.
