Hi, I know on my mail server that approx 32% of the spam that I personally receive have no reverse DNS entries. I just checked on the last 200 of them and that's where the 32% comes from. Oh, let me qualify that statement by saying that I don't list ISP mail servers or what appear to be real ISP mail servers. So that 32% might drop down to around 10 or 20% if I added those IP's back into the list.
I have no idea what percentage of valid email doesn't have a reverse DNS entry since I don't add non-spam to my rbl list. Regards, Rick ----- Original Message ----- From: "Rick Updegrove" <[EMAIL PROTECTED]> To: "Matt Simerson" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Thursday, March 27, 2003 1:18 PM Subject: Re: [vchkpw] Inter7 mail server doesn't have reverse DNS! ----- Original Message ----- From: "Matt Simerson" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, March 27, 2003 7:21 AM Subject: [vchkpw] Inter7 mail server doesn't have reverse DNS! > I started blocking connections to my mail server from servers who don't > have DNS and my vpopmail and qmailadmin list traffic stopped. Matt, How much actual SPAM did your "now-misconfigured mailserver" actually block with this tactic during that time? Before anyone flames me, consider that this is a serious question and I am very interested in the answer.
