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Gary GordonFlag for United States of America

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Cannot send e-mail messages to a particular domain

I think I have a rather tough e-mail, routing or exchange server question.  

A freind of mine has an office building with two businesses in it.  The two businesses are sharing some of their network infrastructure but maintain two different Windows domains.  One of the businesses I will call "G" and the other I shall call "M".  

In a nutshell, "M" can not send e-mail messages to "G."   "M" can send e-mail messages to almost anywhere but "G".  "G" on the other hand can send e-mail to "M" with no difficulty.  Below is my attempt at a network schematic...

                                                         WEB
                                                           |
                                                           |
                                                           |
                                                    Cisco 2600
                                                           |
                                                           |
                              ===========================
                             |                            |                              |
                             |                            |                              |
                             |                            |                              |
                       "G" SBServer       "G" Cisco 800                "M" Cisco 2600
                             |                            |                              |
                             |                            |                              |
                       SWITCH ------------------|                              |------------------- SWITCH
                      |  |     |                                                                                   |  |    |
                      |  |     |                                                                                   |  |    |
                      |  |     |                                                                                   |  |    |            
                      O O    O                                                                                   O O   Windows 2K Term Server



I can send mail to anywhere from "M" but not the Excange server in the Gallagher domain.  Anyone have some insight into what could be wrong?
Avatar of nitadmin
nitadmin
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Are you getting any NDRs? (non-delivery reports).
Do you have Exchange running on Both Servers, G SBServer and Windows 2k Term Server?
Are these two servers in different subnets?
Are these two servers Domain Controller?
Are these two servers in two Separate Active Directory Domains?
Do you have to separate DNS servers?

Cheers,
NITADMIN
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Avatar of Sembee
Sembee
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Do an telenet test on smtp port, also do portqry command too.

http://www.petri.co.il/smtp_pop3_and_telnet.htm
http://www.petri.co.il/quickly_find_remote_open_ports.htm


Cheers,
NITADMIN
Avatar of Ehab Salem
Do you have a publishing rule on the 2600 for both servers? do both servers have published IPs? Are both receiving emails from the outside world?

It looks to me as either an access-list issue on the M 2600 or a routing problem.

I suggest to enable logging on both of the 2600 and trace for the lost mail errors.