Re: Reverse DNS entry
- From: "Jim Harrison" <jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 3 Dec 2003 13:05:59 -0800
You can't send to my mail server while you're in this state, either.
also, try http://www.dnsreport.com
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: "John Tolmachoff (Lists)" <johnlist@xxxxxxxxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Wednesday, December 03, 2003 12:58
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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