We block on RDNS a message is automatically held if adsl is in the rdns. We do have exclusions for our RDNs filter like .SIP. and other exclusions are added only if the email is materail to our business or clients business.
Many I have spoken to do not reguard ADSL as hosting class internet connections. They are mainly for client connectitivity not not for mail servers or for web servers. I have had many a client that started using ADSL for their mail then the spammers hit and the connection became unusable for even surfing. Kevin Bilbee > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Scott Perry > Sent: Wednesday, March 23, 2005 1:44 PM > To: [email protected] > Subject: Re: [IMail Forum] reverse DNS > > > > >65.81.91.10 is the outbound address. .11 is inbound. > > > >Also, these are static. Should static addresses be an exception? We > >aren't acting shifty like dynamic addresses. > > That's exactly the problem. :) Any spam database that claims to block > dynamic IPs (which is what this one is apparently doing) that > lists static > IPs is broken. It's no different than a spam database that > claims to only > include IPs belonging to hardcore spammers that happens to include an AOL > IP. It's an error (incorrect listing). > > "adsl-065-081-091-010.sip.cha.bellsouth.net" has the numbers in it that > make it appear to be a reverse DNS entry that belongs to an ISP -- and > therefore to the ignorant assumed to be a dynamic/dialup IP. > > Of course, there is no logic to assigning something like > "adsl-065-081-091-010.sip.cha.bellsouth.net" to a dynamic IP and a > completely different format (perhaps > "adsl-12345.sip.cha.bellsouth.net") to > static IPs. So the numbering scheme shouldn't be able to > identify dynamic > IPs (it's much better at identifying non-vanity reverse DNS > entries). And > I'm guessing that ".sip." indicates "static IP", so it sounds > like your ISP > has done their job correctly. > > So the short version is that whoever you are trying to send E-mail to is > using poor anti-spam software (that is blocking E-mail on a single > criterion) that is using a poor anti-spam database (one that lists IPs > erroneously, like MAPS-DUL). Combine the two, and well, you get > the billion false positives a year. :) > -Scott > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
