Jason, Many ISPs refuse (for one reason or another) to delegate RDNS. For example, we have a T-1 from MPower in Las Vegas. It is business class. It has is a static block of 8 IPs. Normally considered by most as acceptable to host a mail server. But Mpower refuses to delegate RDNS.
And a few times people on this list have set forth criteria that would classify us as unacceptable. Bundling us into the dynamic IP bunch because of our RNDS from MPower: las-DSL224-cust089.mpowercom.net The most common reason for this reasoning is that most admins consider "DSL" to be equal to "consumer". But there is such a thing as SDSL (symmetric DSL) at speeds > 2Mbit! A better hosting environment than my T-1. In conclusion, I see two distinct problems here: 1. ISPs are not accurately, clearly and fairly specifying RDNS entries. They need to do a better job of this, but have little motivation to do this. 2. Mail admins need to do a better job of creating criteria for mail classification. Don't lump all DSL into spam source. Don't put a lot of stock into what an RDNS says, just that it exists. I really appreciate Pete McNeil's unique approach in building a tool that looks for the same things that I would look for by hand, in the content, not the context. I think we need more out of the box thinking like this. Todd Holt Xidix Technologies, Inc Las Vegas, NV USA www.xidix.com 702.319.4349 > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:Declude.JunkMail- > [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] > Sent: Tuesday, December 16, 2003 7:52 PM > To: [EMAIL PROTECTED] > Subject: [Declude.JunkMail] Does anyone not have Reverse DNS? > > I wanted to throw this question to the list: > > 1) Who does *NOT* have Reverse DNS (PTR) entries for their mailservers? > > 2) If so, why not? > > Personally I think reverse DNS entries adds an ounce of ownership to who > actually uses an IP address. For instance, I have several IPs given to me > by my colo provider. I have reverse DNS on all of them, even the IPs I > haven't used yet. If anyone looks my IPs up they will see something like: > Number.freedom2be.net as reverse DNS. This is basically telling them that > "freedom2be.net" is the operator of the IP address. > > 3) Shouldn't all mail servers on the internet have a reverse DNS entry > with some valid "administrative" domain name? We use "freedom2be.net" > exclusively for our reverse DNS entries. As our mail server is multi-homed > with many different domains. If someone needs to contact the appropriate > owner of the IP, say our mail server was doing something "bad" (which it > never has) they would know that "freedom2be.net" is the domain to email. > (such as [EMAIL PROTECTED]) Isn't this a good idea? > > --Jason > [EMAIL PROTECTED] > > > > > > > --- > [This E-mail was scanned for viruses by Declude Virus > (http://www.declude.com)] > > --- > This E-mail came from the Declude.JunkMail mailing list. To > unsubscribe, just send an E-mail to [EMAIL PROTECTED], and > type "unsubscribe Declude.JunkMail". The archives can be found > at http://www.mail-archive.com. > --- > [This E-mail scanned for viruses by Declude Virus > (http://www.declude.com)] --- [This E-mail scanned for viruses by Declude Virus (http://www.declude.com)] --- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to [EMAIL PROTECTED], and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.
