Re: Reverse DNS entry
- From: "Thomas W Shinder" <tshinder@xxxxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 4 Dec 2003 12:20:35 -0600
Hi John,
Yes, but doesn't have to match the name of the server?
Thanks!
Tom
Thomas W Shinder
www.isaserver.org/shinder
ISA Server 2004 Beta - Coming Soon
ISA Server and Beyond: http://tinyurl.com/1jq1
Configuring ISA Server: http://tinyurl.com/1llp
-----Original Message-----
From: John Tolmachoff (Lists) [mailto:johnlist@xxxxxxxxxxxxxxxxxxx]
Sent: Thursday, December 04, 2003 9:36 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Reverse DNS entry
http://www.ISAserver.org
> I create my own PTR records, but I'm not authoritative for this IP
> address block, so the ISP's name network number names show up in the
> reverse lookup.
So there is a PTR record there. It just may not be correct, but there is
one.
John Tolmachoff
Engineer/Consultant/Owner
eServices For You
> -----Original Message-----
> From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
> Sent: Wednesday, December 03, 2003 7:04 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Re: Reverse DNS entry
>
> http://www.ISAserver.org
>
> Hi Jim,
>
>
> Tom
>
> Thomas W Shinder
> www.isaserver.org/shinder
> ISA Server 2004 Beta - Coming Soon
> ISA Server and Beyond: http://tinyurl.com/1jq1
> Configuring ISA Server: http://tinyurl.com/1llp
>
>
>
>
> -----Original Message-----
> From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
> Sent: Wednesday, December 03, 2003 8:59 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Re: Reverse DNS entry
>
>
> http://www.ISAserver.org
>
> Do you handle your own PTR records?
> I asked and was granted by my ISP...
>
> Jim Harrison
> MCP(NT4, W2K), A+, Network+, PCG
> http://isaserver.org/Jim_Harrison/
> http://isatools.org
> Read the help / books / articles!
>
>
> On Wed, 3 Dec 2003 20:15:54 -0600
> "Thomas W Shinder" <tshinder@xxxxxxxxxxxxxxxxxx> wrote:
> http://www.ISAserver.org
>
> Hi John,
>
> I can send to AOL and Earthlink and other numbskulls who do reverse
DNS
> lookups. What is my secret?
>
> Thanks!
> Tom
>
> -----Original Message-----
> From: John Tolmachoff (Lists) [mailto:johnlist@xxxxxxxxxxxxxxxxxxx]
> Sent: Wednesday, December 03, 2003 2:59 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Re: Reverse DNS entry
>
> http://www.ISAserver.org
>
> The reverse lookup needs to be done on the DNS server that is
> authoritive for the IP address. Most of the time, this is the ISP.
> However, sometimes the ISP will delegate authority for those IP
> addresses to the client.
>
> Go here to test:
>
> http://www.dnsstuff.com/
>
> Also, see this:
>
> http://www.dnsstuff.com/info/revdns.htm
>
> Not having a PTR record is a violation of the RFCs. If you are going
to
> be using a mail server on the Internet, you must understand and play
by
> the rules.
>
> And yes, you will not be able to send to AOL without a PTR record, as
> well as many smaller domains.
>
> John Tolmachoff
> Engineer/Consultant/Owner
> eServices For You
>
>
> > -----Original Message-----
> > From: Nef Perez [mailto:nperez@xxxxxxxxxxxxxxx]
> > Sent: Wednesday, December 03, 2003 12:47 PM
> > To: [ISAserver.org Discussion List]
> > Subject: [isalist] Re: Reverse DNS entry
> >
> > http://www.ISAserver.org
> >
> >
> > Jim -
> > We have the Exchange server in house. Do you mean I need to contact
my
>
> > ISP? Nothing to be done on our ISA server?
> >
> > Thanks!
> >
> >
> > -----Original Message-----
> > From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
> > Sent: Wednesday, December 03, 2003 3:42 PM
> > To: [ISAserver.org Discussion List]
> > Subject: [isalist] Re: Reverse DNS entry
> >
> > http://www.ISAserver.org
> >
> > Actually, you have to ask your provider for that.
> > Tell them you'd like a pointer (PTR) record created for your mail
> > server's fully-qualified domain name (mail.domain.tld, for
instance).
> >
> >
> > Jim Harrison
> > MCP(NT4, W2K), A+, Network+, PCG
> > http://www.microsoft.com/isaserver
> > http://isaserver.org/Jim_Harrison
> > http://isatools.org
> >
> > Read the help, books and articles!
> > ----- Original Message -----
> > From: <nperez@xxxxxxxxxxxxxxx>
> > To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> > Sent: Wednesday, December 03, 2003 12:47
> > Subject: [isalist] Reverse DNS entry
> >
> >
> > http://www.ISAserver.org
> >
> > I get an error when I try to send emails to certain domains. The
error
>
> > reads, "Your IP (xxx.xxx.xxx.xx) does not have a reverse DNS entry.
> > Please
> > contact YOUR system administrator or YOUR internet provider.
> > Disconnecting..." Why would some email servers reject if I don't
have
> > reverse DNS entry? How do I create a reverse DNS entry? Is it safe?
> >
> > Thanks!
> >
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