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Can't send mail to one email server which is on my DMZ

Posted on 2008-10-01
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Last Modified: 2012-05-05
Can't send mail to one email server which is on my DMZ
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Question by:ilovespam12000
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36 Comments
 

Author Comment

by:ilovespam12000
ID: 22618962
I can telnet to the other email servers port. I can resolve the address. All mail to the domain is left in the queue.
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Expert Comment

by:mgonullu
ID: 22619176
Did you checked if the appropriate ports are open? on the server or no firewall?
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Author Comment

by:ilovespam12000
ID: 22619221
I can telnet to port 25 on the remote server..
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Author Comment

by:ilovespam12000
ID: 22619223
The following ports are also open IMAP3 + 4, SMTP, POP, HTTP
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LVL 9

Expert Comment

by:mgonullu
ID: 22619237
can you remove the server temporarily from the DMZ zone and test if this will work?
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Author Comment

by:ilovespam12000
ID: 22619261
Sorry no. The DMZ server is acting as a forwarding server for email.
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Expert Comment

by:mgonullu
ID: 22619282
Ok, in that case try to use a packet listener to see where is the problem and why the emails are not reaching the server?
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Author Comment

by:ilovespam12000
ID: 22619351
Done that. I can allow all packets through (LAN -> DMZ) and nothing. I'm not an expert on DNS and I'm leaning DNS. Any thoughts?
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Expert Comment

by:mgonullu
ID: 22619365
can you do connection by ip address?
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Author Comment

by:ilovespam12000
ID: 22619371
I'm reading about bypassing DNS using exchange SMTP connectors. Any
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Author Comment

by:ilovespam12000
ID: 22619380
What do you mean by your last question?
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Expert Comment

by:mgonullu
ID: 22619393
I mean use the mail server ip number instead of its DNS name? will that work, if yes we will see how to solve that DNS problem
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Author Comment

by:ilovespam12000
ID: 22619411
Can you provide technical directions unless you are referring to telneting to port 25 via address or IP please?
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Author Comment

by:ilovespam12000
ID: 22619437
Both IP and DNS resolve using telnet to port 25
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Expert Comment

by:mgonullu
ID: 22619461
I don't think that it is a DNS problem, the server is not seeing the packets for a reason, hmm we need more testing again on the server, did you tried to restart the services related ?
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Author Comment

by:ilovespam12000
ID: 22619484
Yes. Several times.
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Expert Comment

by:mgonullu
ID: 22619531
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Author Comment

by:ilovespam12000
ID: 22619627
Installed. Now what? Everything looks fine.
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Expert Comment

by:mgonullu
ID: 22619656
can you see anything in the logs?
any thing coming to the server and dropped there?
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Author Comment

by:ilovespam12000
ID: 22619660
Nothing arriving at the server. Exchange has the domain in the retry queue for all messages.
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Author Comment

by:ilovespam12000
ID: 22619693
I need to leave for tonight.
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Expert Comment

by:mgonullu
ID: 22621583
Man I believe that the network is ok now but your server is unresponsive :(
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Author Comment

by:ilovespam12000
ID: 22623870
The server is up again. I'm trying to migrate as soon as possible; however, this one routing issue is preventing me from moving forward.
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Author Comment

by:ilovespam12000
ID: 22623880
I increased the points. Any exchange and routing people out there? I can send emails to all domains except the one on my DMZ; however, I can telnet to the computer on the DMZ.
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Author Comment

by:ilovespam12000
ID: 22626845
mgonullu:

Any ideas?
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Expert Comment

by:mgonullu
ID: 22629301
sorry man for not able to logon during the day give me a while I will try to investigate
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Expert Comment

by:mgonullu
ID: 22629360
Hey friend, what are you using for DMZ?
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Author Comment

by:ilovespam12000
ID: 22633070
My corporate firewall separates lan, wan and dmz. The error in exchange that I keep getting is "unable to bind to the destination server in DNS"
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Expert Comment

by:mgonullu
ID: 22633125
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Expert Comment

by:mgonullu
ID: 22633130
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Author Comment

by:ilovespam12000
ID: 22633302
I'm not a DNS guy.

Do I need to add a mx record to the forward lookup of the destination I'm having trouble connecting to?
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Accepted Solution

by:
mgonullu earned 500 total points
ID: 22633320
yes that is it, please try
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Author Comment

by:ilovespam12000
ID: 22633366
Can I test this on a personal computer using the host file, lmhost file or something similar prior to implementing in our organization?
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Author Comment

by:ilovespam12000
ID: 22633468
I don't believe it. I think it's working!!!
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Author Closing Comment

by:ilovespam12000
ID: 31502168
Awesome! It works!
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Expert Comment

by:mgonullu
ID: 22633654
good
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