Re: Reverse DNS entry
- From: Jim Harrison <jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 03 Dec 2003 20:25:43 -0800
You're absolutely correct.
nslookup for starblazer.tzo.com results in 64.90.59.34, but nslookup for
returns taca-1.august.net for 64.90.59.34.
So long as there is a PTR record that I don't specifically block, you're ok.
The ones I refuse are the non-resolving or blocked names / IPs.
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 21:04:10 -0600
"Thomas W Shinder" <tshinder@xxxxxxxxxxxxxxxxxx> wrote:
http://www.ISAserver.org
Hi Jim,
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.
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!
>
> ------------------------------------------------------
> List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
> ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
> ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
> ------------------------------------------------------
> Other Internet Software Marketing Sites:
> Leading Network Software Directory: http://www.serverfiles.com
> No.1 Exchange Server Resource Site: http://www.msexchange.org Windows
> Security Resource Site: http://www.windowsecurity.com/ Network
> Security Library: http://www.secinf.net/ Windows 2000/NT Fax
> Solutions: http://www.ntfaxfaq.com
> ------------------------------------------------------
> You are currently subscribed to this ISAserver.org Discussion List as:
> jim@xxxxxxxxxxxx
> To unsubscribe send a blank email to
> $subst('Email.Unsub')
>
>
> ------------------------------------------------------
> List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
> ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
> ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
> ------------------------------------------------------
> Other Internet Software Marketing Sites:
> Leading Network Software Directory: http://www.serverfiles.com
> No.1 Exchange Server Resource Site: http://www.msexchange.org Windows
> Security Resource Site: http://www.windowsecurity.com/ Network
> Security Library: http://www.secinf.net/ Windows 2000/NT Fax
> Solutions: http://www.ntfaxfaq.com
> ------------------------------------------------------
> You are currently subscribed to this ISAserver.org Discussion List as:
> nperez@xxxxxxxxxxxxxxx
> To unsubscribe send a blank email to
> $subst('Email.Unsub')
>
> ------------------------------------------------------
> List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
> ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
> ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
> ------------------------------------------------------
> Other Internet Software Marketing Sites:
> Leading Network Software Directory: http://www.serverfiles.com
> No.1 Exchange Server Resource Site: http://www.msexchange.org Windows
> Security Resource Site: http://www.windowsecurity.com/ Network
> Security Library: http://www.secinf.net/ Windows 2000/NT Fax
> Solutions: http://www.ntfaxfaq.com
> ------------------------------------------------------
> You are currently subscribed to this ISAserver.org Discussion List as:
> johnlist@xxxxxxxxxxxxxxxxxxx
> To unsubscribe send a blank email to
> $subst('Email.Unsub')
------------------------------------------------------
List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
------------------------------------------------------
Other Internet Software Marketing Sites:
Leading Network Software Directory: http://www.serverfiles.com
No.1 Exchange Server Resource Site: http://www.msexchange.org Windows
Security Resource Site: http://www.windowsecurity.com/ Network Security
Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions:
http://www.ntfaxfaq.com
------------------------------------------------------
You are currently subscribed to this ISAserver.org Discussion List as:
tshinder@xxxxxxxxxxxxxxxxxx To unsubscribe send a blank email to
$subst('Email.Unsub')
------------------------------------------------------
List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
------------------------------------------------------
Other Internet Software Marketing Sites:
Leading Network Software Directory: http://www.serverfiles.com
No.1 Exchange Server Resource Site: http://www.msexchange.org
Windows Security Resource Site: http://www.windowsecurity.com/
Network Security Library: http://www.secinf.net/
Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com
------------------------------------------------------
You are currently subscribed to this ISAserver.org Discussion List as:
jim@xxxxxxxxxxxx
To unsubscribe send a blank email to $subst('Email.Unsub')
------------------------------------------------------
List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
------------------------------------------------------
Other Internet Software Marketing Sites:
Leading Network Software Directory: http://www.serverfiles.com
No.1 Exchange Server Resource Site: http://www.msexchange.org
Windows Security Resource Site: http://www.windowsecurity.com/
Network Security Library: http://www.secinf.net/
Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com
------------------------------------------------------
You are currently subscribed to this ISAserver.org Discussion List as:
tshinder@xxxxxxxxxxxxxxxxxx
To unsubscribe send a blank email to $subst('Email.Unsub')
------------------------------------------------------
List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
------------------------------------------------------
Other Internet Software Marketing Sites:
Leading Network Software Directory: http://www.serverfiles.com
No.1 Exchange Server Resource Site: http://www.msexchange.org
Windows Security Resource Site: http://www.windowsecurity.com/
Network Security Library: http://www.secinf.net/
Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com
------------------------------------------------------
You are currently subscribed to this ISAserver.org Discussion List as:
jim@xxxxxxxxxxxx
To unsubscribe send a blank email to $subst('Email.Unsub')
Other related posts:
