SORBS decided last week to list all of the IP's in my ISP's range as "Dailup". SORBS removed them without any problem but these IP's are provisioned to my ISP from Level-3. They've done this twice in two years now.
How do they decide to change the status of these IP's on a given day? The IP's in question even have a reserve lookup to the ISP that doesn't contain .biz, dialup, or any other generic method of identification. I have been loosing faith in these RBL companies but not as fast as I have been in the ISP's that are rejecting out outbound mail. We discovered this because one of our clients sent an email from his office to his home account and got a bounce back saying he was a spammer. He was irritated as his home account is also on a custom domain through another company. They just took it upon themselves to reject his mail. We on the other hand mark it up and pass it on. So my rant now is SORBS is starting to suck... > -----Original Message----- > From: Daryl C. W. O'Shea [mailto:[EMAIL PROTECTED] > Sent: Wednesday, June 07, 2006 10:18 PM > To: [EMAIL PROTECTED] Apache. Org > Subject: Re: is there a way to block email coming from > > On 6/8/2006 12:05 AM, Greg Allen wrote: > >>However, the ISP dynamic address tests *do* belong in the MTA RBL > >>checks. The fraction of legitimate emails received from dynamic-IP > >>hosts is vanishingly small compared to the tens or hundreds of > >>thousands of compromised Windows boxen spewing spam and viruses... > >> > > > > > > Sorry to poke in on the thread, but I disagree. > > > > Most small start-up businesses buy business class DSL these days with 1- > 5 > > fixed IP addresses. They often have small firewalls, anti-virus, most > > everything they should have. They probably don't have a full time IT > staff. > > > > There are a lot of small businesses on these legitimate business class > DSL > > lines with fixed IP addresses (which they pay extra for) who are very > > frequently incorrectly listed as "dynamic" IP addresses. The vast > majority > > of these small companies are NOT spammers. > > Some of those small businesses aren't really all that small either. > There are a number of ~500 employee companies around here that have the > same problem. Some even with T1s (probably quietly provisioned over > DSL) that have IPs smack in the middle of static business DSL ranges > that are listed in SORBS' dynamic list. > > > > If you are a system admin and you flat-out reject email that shows on > > various error ridden "dial-up" lists as "dynamic" IP address for a > company, > > other than your own, you should be fired IMO. > > Likewise, if you're a system admin that is aware that they are in such > dynamic lists and can't get out of them, you're asking for trouble not > smart hosting your mail through a (RBL list-wise) cleaner relay. > > I know that in the automotive industry there are a lot of tier 1 > suppliers and a number of MXes at a couple auto manufacturers that > reject on SORBS dynamic listings (of truly static space). Having mail > blocked, or worse silently discarded or unread, could easily cost you a > LOT of revenue. Having this happen when it's avoidable on your own part > is inexcusable, no matter how annoying it is that you can't send mail > directly from IP space that you are paying to do so with. > > > Daryl
