Solved

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

Posted on 2008-10-01
36
280 Views
Last Modified: 2012-05-05
Can't send mail to one email server which is on my DMZ
0
Comment
Question by:ilovespam12000
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 21
  • 15
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.
0
 
LVL 9

Expert Comment

by:mgonullu
ID: 22619176
Did you checked if the appropriate ports are open? on the server or no firewall?
0
 

Author Comment

by:ilovespam12000
ID: 22619221
I can telnet to port 25 on the remote server..
0
Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

 

Author Comment

by:ilovespam12000
ID: 22619223
The following ports are also open IMAP3 + 4, SMTP, POP, HTTP
0
 
LVL 9

Expert Comment

by:mgonullu
ID: 22619237
can you remove the server temporarily from the DMZ zone and test if this will work?
0
 

Author Comment

by:ilovespam12000
ID: 22619261
Sorry no. The DMZ server is acting as a forwarding server for email.
0
 
LVL 9

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?
0
 

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?
0
 
LVL 9

Expert Comment

by:mgonullu
ID: 22619365
can you do connection by ip address?
0
 

Author Comment

by:ilovespam12000
ID: 22619371
I'm reading about bypassing DNS using exchange SMTP connectors. Any
0
 

Author Comment

by:ilovespam12000
ID: 22619380
What do you mean by your last question?
0
 
LVL 9

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
0
 

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?
0
 

Author Comment

by:ilovespam12000
ID: 22619437
Both IP and DNS resolve using telnet to port 25
0
 
LVL 9

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 ?
0
 

Author Comment

by:ilovespam12000
ID: 22619484
Yes. Several times.
0
 
LVL 9

Expert Comment

by:mgonullu
ID: 22619531
0
 

Author Comment

by:ilovespam12000
ID: 22619627
Installed. Now what? Everything looks fine.
0
 
LVL 9

Expert Comment

by:mgonullu
ID: 22619656
can you see anything in the logs?
any thing coming to the server and dropped there?
0
 

Author Comment

by:ilovespam12000
ID: 22619660
Nothing arriving at the server. Exchange has the domain in the retry queue for all messages.
0
 

Author Comment

by:ilovespam12000
ID: 22619693
I need to leave for tonight.
0
 
LVL 9

Expert Comment

by:mgonullu
ID: 22621583
Man I believe that the network is ok now but your server is unresponsive :(
0
 

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.
0
 

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.
0
 

Author Comment

by:ilovespam12000
ID: 22626845
mgonullu:

Any ideas?
0
 
LVL 9

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
0
 
LVL 9

Expert Comment

by:mgonullu
ID: 22629360
Hey friend, what are you using for DMZ?
0
 

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"
0
 
LVL 9

Expert Comment

by:mgonullu
ID: 22633125
0
 

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?
0
 
LVL 9

Accepted Solution

by:
mgonullu earned 500 total points
ID: 22633320
yes that is it, please try
0
 

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?
0
 

Author Comment

by:ilovespam12000
ID: 22633468
I don't believe it. I think it's working!!!
0
 

Author Closing Comment

by:ilovespam12000
ID: 31502168
Awesome! It works!
0
 
LVL 9

Expert Comment

by:mgonullu
ID: 22633654
good
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Lotus Notes – formerly IBM Notes – is an email client application, while IBM Domino (earlier Lotus Domino) is an email server. The client possesses a set of features that are even more advanced as compared to that of Outlook. Likewise, IBM Domino is…
This article will help to fix the below errors for MS Exchange Server 2013 I. Certificate error "name on the security certificate is invalid or does not match the name of the site" II. Out of Office not working III. Make Internal URLs and Externa…
The basic steps you have just learned will be implemented in this video. The basic steps are shown to configure an Exchange DAG in a live working Exchange Server Environment and manage the same (Exchange Server 2010 Software is used in a Windows Ser…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
Suggested Courses
Course of the Month11 days, 11 hours left to enroll

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question