RE: SMTP Queue-E-mail stucks on it

  • From: "Hooda, Kuljit Singh" <KSH@xxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 28 Jul 2005 16:35:21 +0530

Your DNS is not able to resolve the outside world address. If your ISP
allows to relay through their server then put their entry in smart host
in SMTP virtual server, Otherwise put DNS forwarder in the properties of
your DNS server.


From: mmmopo errer [mailto:hatem20072008@xxxxxxxxx] 
Sent: Thursday, July 28, 2005 3:31 PM
To: [ExchangeList]
Subject: [exchangelist] SMTP Queue-E-mail stucks on it 
Dear All,
I have something happen here, which is UPNORMAL.
We were having  workgroup with 25 users, and one WinProxy Box with 2 Nic
cards on it, and one connected to the LAN, and one connect to the ISP
through VSAT with Real IP.
No DNS internal at all, all of my users configured with Default gateway
of the internal IP of WinProxy , and also able to browse internet with
WebProxy client of WinProxy.
Also, the mail server which is hosted in USA, we were using POP3 on
MS-outlook behind the WinProxy- i mean in the configuration of outlook,
we used to put the IP-Address of WinProxy in the POP3 & SMTP of outlook,
and we were able to send and receive E-mails Normally.
the situation has been changed.
i create local domain with WinServer 2000 Advanced server SP4 with the
DNS internal.
I install Exchange server 2003 Standard edition & POP3 Downloader on it.
My Internal DNS was the Root.
Now i can see something here, which is , i am able to receive any
E-mails from any domain on exchange server account through the POP3
downloader, while when i am trying to send any E-mails from exchange
account , all of my E-mails Get stuck in the Queue of SMTP Connector and
unable to send it to outside.
The configuration of POP3 Downloader it self is to connect to the POPe
server which is the Internal WinProxy IP-Address with the user name and
Password. ( as the old configuration ).
The configuration of SMTP Virtual server it self - Not SMTP Connector -
is to send all of the E-mails to the Smarthost which is the Internal
IP-Address of WinProxy.
The Configuration of SMTP - connector - is to Forward all of the E-mail
through this connector to this smarthost which is the Internal
IP-Address of WinProxy.
we also configure this SMTP Connector to Request ETRN/TURN.
the Exchange server it self is configured with the DNS & Gateway and it
working Normally with the DNS it self, i mean by using NSLOOKP, i am
able to see the DNS DB.
The DNS it self which is installed on the D/C which has this IP-Address
( is working normally.
the DNS it self is Root.
No any special configuration in the Zone it self like MX .
FOR WinProxy, it has 2 Nic Cards, the first one which is connected to
our Internal LAN , is configured only with the IP-address internal and
with subnet mask , and without any Internal DNS or external DNS on it at
all, and even there is no any DNS suffix .
the second one which is connected to the Satalite is configured with
External DNS .
Even if we open the configuration of WinProxy, we will see its include
only inside it the external DNS which has been given to us from ISP, in
order to let my users or let the WinProxy do the name resolution without
any Problem, that is why we are able to browse internet.
Now, i think i have something missed or something issue with the DNS it
self, because as i understood the Smarthost is like man in the middel
and your exchange server is send all the e-mails to it and the Smarthost
goes and ask the Global DNS for where is the MX recorde for this E-mail.
But in my case, who is my Smarthost ? ( i think its the WinProxy).
what i did is :-
i delete the root and configure the  internal DNS to forward all the
queries to the internal IP-Address of WinProxy . this what i did, and
from any client, when i run Nslookup , i can see the internet address of
any domain and i can see the MX recorde of any domain , ( its doing     
Non-authoritative answer ) - 
the D/C which has the internal Nic, configured only with IP & DNS which
is it self, No Gateway, no webProxy Client on the DC. at all.
 when i am trying to see for example the MX recorde of our mail server
from internal DNS server,  which is ( ) its give me the
following result :-
> set q=mx
        primary name server =
        responsible mail addr =
        serial  = 42
        refresh = 15 (15 secs)
        retry   = 10 (10 secs)
        expire  = 86400 (1 day)
        default TTL = 3600 (1 hour)
BUT  if i made the same Request from the WinProxy which is connect to
the internet , i found that it gives me another Result :-
  > set q=mx
Non-authoritative answer:  MX preference = 10, mail exchanger =  MX preference = 20, mail exchanger =       internet address =       internet address =       internet address =       internet address =
is that meaning of some DNS Problem Issues or what ? 
i want the Smarthost which is configured in the exchange to send the
E-mails outside.
i think this is because of the DNS issue, why, when the exchange server
has an E-mail, its looking first if its inside his orgnaization or not,
if its not, it will see if its configured to send the mail directly or
not, if not it will see the smarthost which i configured, and in my case
its the WinProxy, so the winProxy, should be able to receive the mail
and forward it to its destination, that what we are trying to implement
 i am thinking of doing the following :-
1. on the internal NIC of WinProxy, i will add tje internal DNS, in
order to let the WinProxy Register Him Self in the DNS local, then the
DNS it self will able to know that this is his Smarthost.
why i am doing like that, because it seems to me that the exchange
server cant see at all the smarthost, its unable to find it at all , so
i think its .
Can any one advice me what is going on , why there is a diffrient
between the result in nslookup on the internal DNS & External DNS ?
Please Advidce .


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