<snip> >> >> Not completely correct. What you refer to is the fact that it can >> happen that the reverse lookup results in a different name than >> the domain provided originally, e.g. >> >> $ urpmi bind-utils >> $ host www.nic.de >> www.nic.de has address 194.246.96.76 >> >> but >> >> $ host 194.246.96.76 >> 76.96.246.194.in-addr.arpa domain name pointer direct.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer intern.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer member.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer secure.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer project.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer transit.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer wwwtest.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer intern-old.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer www.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer jobs.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer test.denic.de. >> 76.96.246.194.in-addr.arpa domain name pointer board.denic.de. >> >> Although they made the effort to list all the reverse lookups, they >> missed www.nic.de in their list. So if the server makes a connection >> as www.nic.de (which they probably don't do), the other side would end >> up with a different name by the reverse lookup. > >Having a different name on reverse lookup does not block the mail. >This message got through from topoi.pooq.com, and it looks up as follows: <snip> >So although reverse lookip of the IP number gives a different name from >topoi.pooq.com, when (if?) it looks up that different name it still gets the >proper IP number. By the way, I'm told that one of the purposes of using >the reverse name lookup is to catch stolen IP numbers, which apparently >has been a big problem in some countries. > >-- hendrik The point here was that there is no reverse entry for (in the example above), www.nic.de .
This wasn't debating whether or not an e-mail would get sent if the reverse lookup entries were correct, but what would happen if they are incorrect or missing. Michael -- Michael Viron Database & Web Statistics Administrator Core Systems Group Simple End User Linux
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