Fuhrmanator Posted October 15, 2004 Share Posted October 15, 2004 Hi there, My school and its ISP have had some wonderful past experiences with configuring the DNS servers such that it causes problems that are tough to debug. Right now, when I try to report a spam, SC says that one of the servers can't be trusted, because it doesn't have a unique host name (I suppose that either means it doesn't do reverse DNS properly). Here's the line from the detailed SC report at http://www.spamcop.net/sc?id=z682460723z81...bd83041296564dz ---------- 3: Received: From Amnesix.uqss.uquebec.ca ([220.127.116.11]) by ns1.etsmtl.ca (WebShield SMTP v4.5 MR1a); id 1097811082122; Thu, 14 Oct 2004 23:31:22 -0400 No unique hostname found for source: 18.104.22.168 ETS received mail from sending system 22.214.171.124 ---------- I used an on-line web tool to reverse DNS 126.96.36.199 and it yields the following: ---------- Reverse Lookup Results Host Type Value 188.8.131.52.in-addr.arpa PTR Amnesix.uqss.uquebec.ca 51.77.192.in-addr.arpa NS clouso.risq.qc.ca 51.77.192.in-addr.arpa NS Amnesix.uqss.uquebec.ca 51.77.192.in-addr.arpa NS Asterix.uqss.uquebec.ca clouso.risq.qc.ca A 184.108.40.206 ---------- The PTR line appears to match what's in the SMTP header -- not sure if that means the reverse DNS is good. But perhaps SC's lookup was different (or worse, the reverse DNS is giving intermittently different results from different places -- this was the kind of problem we were having last year). Can anyone help me understand where the problem is? In the mean time, I've stopped reporting spam, since it wants to point to my school's ISP as the source (which I highly doubt). Thanks! Link to comment Share on other sites More sharing options...
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