[Declude.JunkMail] CBL Blocks

[Orin Wells]

I received a contact from one of our customers who discovered an e-mail from within his own domain had been stuck into the spam box.  When I investigated I found out that it had been tagged by the CBL test.  Looking further if found the email address was on three different black lists.  OK, but the problem is this is a dynamic address belonging to T-Mobile I suspect.  This implies that some dynamic customer had connected while infected by a piece of spam software and got the IP logged.  Now anyone connecting and receiving the address will be blacklisted.

How do you handle this sort of thing?

The IP address, in case anyone is curious, is 208.54.14.65.  The CBL probe says it was de-listed on 6/23/2005 but re-listed on 7/30/2005 (yesterday).  There are two other services where it is listed - DNSBLNETAUTI (DNSBLNET Australia pointing back to cbl_abuseat.org) and SBL-XBL pointing back to Spamhaus.org.

Is anyone using such services (T-Mobile - may be assigned to Blackberry communications) where dynamic IP assignment is the rule just at the mercy of whoever got it earlier?  Is it even worth the effort to attempt to get the addresses de-listed?  Should the ISP service be advised when one of their IP addresses is discovered as listed?  I suppose it is too much to expect the black lists to be able to recognize dynamic addresses and just not bother to list them or at least set them on some timer to release after a bit.




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