Hello,
I just found out, the the Astaro RBL is not (yet) IPv6 capable:
exim-in[14144]: 2013-01-13 21:21:02 DNS list lookup defer (probably timeout) for 0.7.f.d.3.c.e.f.f.f.d.7.d.1.2.0.6.9.9.0.0.1.0.0.8.c.1.4.1.0.0.2.black.rbl.ctipd.astaro.local: assumed not in list
I hope this will be fixed in future versions, to also filter mail from IPv6 hosts.
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