On Thu, 2004-09-09 at 21:09, Steve Buehler wrote: > At 07:26 AM 9/9/2004, you wrote: > > >On Thu, Sep 09, 2004 at 04:50:18PM +0630, Mrs. Geeta Thanu wrote: > > > 554 5.7.1 The server sending your mail[210.212.212.2] does not have a > > > reverse DNS entry.connection rejected.Please conatct your network ISP > > > provider.Default reject! > > > >This used to be a common rejection, when each site was assigned its > >own IP address(es). It then became less common, as assignment of IP > >addresses from ISPs became the norm. Now, it appears that some sites, > >in a probably misguided attempt to reject spammers, have returned to > >trying to validate IP addresses. I say misguided since (a) most spam > >is from owned machines, so it won't help, and (b) most admins won't have > >arranged with their ISPs--and many ISPs aren't willing to--provide PTR > >records that reflect the originating domain. > > Unless this has changed in the last day or so, since I haven't heard any > complaints or noticed any rejected mail, the reverse DNS does not have to > say the domain name that is on that IP. We have 2 class C's and the > reverse DNS's all say client.ibapp.com. I also have a couple of servers at > my house with just 5 IP's total and I don't have to have SWBell (my DSL > ISP) setup a reverse DNS that matches the domain names of my machines since > they already have "adsl-xx-xx-xxx-xxx.dsl.kscymo.swbell.net" (real IP x'd > out) as the reverse DNS entry and I do not get blocked by anybody. We > started this when AOHell started rejecting email because of reverse DNS not > being setup for the domains on our servers and have not had any problems > since. So basically, you just have to have a reverse DNS, it doesn't have > to be correct for your mail to stop getting rejected. I know that it > should be setup correctly with the domain name that is actually doing it, > but sometimes, for some people, that might not be feasible. It may....or it may not.... Some SW does go so far as to do a double-reverse DNS lookup as well as compare what it gets in the helo/ehlo with what the incoming IP resolves to. Yes, "misguided" is probably a good description for this behavior..but I could think of others. :-) Ed -- "I think the problem, to be quite honest with you, is that you've never actually known what the question is." --The computer "Deep Thought" in "Hitchhiker's Guide to The Galaxy" -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
