So, to read that log for humans, 66.96.189.4 is establishing a connection on port 25, dropping an email to scherer@schererinvestments.com... next thing, bind tries to resolve clickme2.click2site.com/AAAA/IN and fails to connect to the network with "network unreachable"... further questions: - Is postfix supposed to accept connections * from outside? * on port 25 (unauthenticated smtp)? - Is bind supposed to * accept connections from outside? * fail on that lookup? Are in the breakage both or only one of those services involved? [1] is not the kind of lockup you're talking about, or IS IT? Does the problem occur with community/unbound [2]? cheers! mar77i [1] http://www.theregister.co.uk/2011/02/24/dns_bind_vuln/ [2] http://unbound.net/