According to the several messages
(http://www.merit.edu/mail.archives/nanog/msg12818.html) and
(http://slashdot.org/articles/03/08/27/0214238.shtml?tid=111&tid=126), the
Osirusoft blacklists have been shutdown, and are currently rejecting email
from all incoming addresses.
This has implications for DNSRBLs in general including the BCP area - how
to account for a DNSRBL shutting down or being unreachable due a DDOS attack.
Yakov
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