Security Basics mailing list archives
Re: educating rDNS violators
From: Derek Schaible <dschaible () cssiinc com>
Date: Wed, 25 Aug 2004 07:00:35 -0400
On Mon, 2004-08-23 at 15:24, JGrimshaw () ASAP com wrote:
I was under the impression that reverse DNS for the Internet was essentially broken, due to several large ISPs not necessarily implementing reverse DNS for their many subnetted customers.
I have the (mis)fortune of being a customer of a large ISP who resells a portion of a class C to us. As with most customers in this situation I run my own DNS with no authority over my reverse DNS. But if you call your ISP's help line and ask them to correct your reverse DNS entry for your mail servers they more than likely will be ecstatic to help you out. Personally, I can say my spam reduced over 85% by dropping mail that doesn't come from a server with correct reverse DNS information. All ISP's want to see spam reduced and if your ISP won't assist you in correcting your reverse info, I'd be shopping for a new ISP. Hope this helps someone out! -- Derek Schaible <dschaible () cssiinc com> CSSI, Inc.
Attachment:
signature.asc
Description: This is a digitally signed message part
Current thread:
- Re: educating rDNS violators, (continued)
- Message not available
- Re: educating rDNS violators Derek Schaible (Aug 25)
- RE: educating rDNS violators David Gillett (Aug 26)
- Re: educating rDNS violators token (Aug 26)
- RE: educating rDNS violators David Gillett (Aug 30)
- Re: educating rDNS violators Niek (Aug 26)
- Re: educating rDNS violators Derek Schaible (Aug 30)
- Re: educating rDNS violators James Kelly (Aug 25)
- Re: educating rDNS violators Bryan S. Sampsel (Aug 25)
- Re: educating rDNS violators SMiller (Aug 26)
- Re: educating rDNS violators Derek Schaible (Aug 25)
- Re: educating rDNS violators Mark Reis (Aug 28)
- Re: educating rDNS violators Derek Schaible (Aug 30)
- Re: educating rDNS violators Bryan S. Sampsel (Aug 30)