Date: Wed, 6 Aug 2003 12:14:09 -0500 From: Doug Poland <doug@polands.org> To: Bruce Pea <pea@andrewpea.com> Cc: questions@freebsd.org Subject: Re: ISPs blocking SMTP connections from dynamic IP address space Message-ID: <20030806171408.GA459@polands.org> In-Reply-To: <19175993.1060169841@[192.168.10.11]> References: <Pine.BSF.4.05.10308061232270.1659-100000@buffnet5.buffnet.net> <19175993.1060169841@[192.168.10.11]>
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On Wed, Aug 06, 2003 at 11:37:21AM -0500, Bruce Pea wrote: > --On Wednesday, August 06, 2003 12:33 PM -0400 Steve Hovey > > > >I now block ip's with no reverse dns > > We are doing this as well. We get a fair number of complaints from people > who's mail doesn't get delivered but we tell them to fix their DNS so we > know someone isn't trying to spoof us. So far, 23 out of 25 organizations > complaining have fixed their DNS. > This isn't a reverse DNS issue. This is the connecting host with an IP address in a range ISP's have decided is "dynamically assigned". This IP address range is then blocked from connecting on port 25. I believe the FreeBSD mail servers use reverse DNS to help control spam and I'm OK with that. I have resolvable DNSs but am being blocked because my IP is in Roadrunners 24. network. -- Regards, Doug
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