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Company Mergerd, change the email domain to match that of an existing domain

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  • Company Mergerd, change the email domain to match that of an existing domain

    OK Guys, I am stumped here,

    Here is the situation,

    My company's email domain name is xyz.com and users email addresses are like [email protected], this domain's MX record pointing at public IP address. We are using exchange 2000 on AD 2003.

    Now about year ago a new company with name abc.com bought our company, they users have email address in the form [email protected] and they also have MX record pointing to different public IP then ours, they are based on Exchange 2003 on AD 2003 platform,

    Now the question, my management has asked me to check the possibility of changing my old company's email domain to match that of new company's, so basically all the users in my old company and new company should have email address in the form of [email protected].

    how is this possible? our networks at both locations are not connected in anyways other then internet,

    How some company's have two or three IP address tied to their MX record?

    Please help,

  • #2
    Re: Company Mergerd, change the email domain to match that of an existing domain

    you would need to setup a routing group, and associated routing group connector...

    or merge the two forests into one forest.

    basically - you can GIVE your users the @abc.com addresses, but it won't matter if the public email can't get to it.
    similarly, if you tell your exchange server it's authoritative for @abc.com addresses, then email won't go over to the actual @abc.com users...

    So your best option is probably to merge the two domains/forests using the ADMT application...

    although some of the other guys may have more feedbac
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    • #3
      Re: Company Mergerd, change the email domain to match that of an existing domain

      What you are talking about is sharing the SMTP address space.
      http://support.microsoft.com/kb/321721

      That allows you to have two independant networks using the same SMTP domain, without having to go through a complex merger.

      Simon.
      Last edited by Sembee; 17th February 2010, 12:52.
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      • #4
        Re: Company Mergerd, change the email domain to match that of an existing domain

        that looks like a much neater idea simon, thanks
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        • #5
          Re: Company Mergerd, change the email domain to match that of an existing domain

          Thank you very much Sembee and tehcamel,

          Is there any kind of complication occurs with this method? I was reading an article on the msexchange.org site and the author suggested that even though it is possible you should avoid it for complication and it is not the recommended solution

          http://www.msexchange.org/tutorials/...e-Sharing.html
          Last edited by Sembee; 17th February 2010, 21:01. Reason: Link Correction

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          • #6
            Re: Company Mergerd, change the email domain to match that of an existing domain

            The reasons for not doing it are rather weak. As long as everything is clearly documented then it isn't a cause of many problems.

            You don't really have many choices though. Exchange is designed to presume it is responsible for all email for a domain, which means that when it is not, you need a way to manage that.

            Simon.
            --
            Simon Butler
            Exchange MVP

            Blog: http://blog.sembee.co.uk/
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            • #7
              Re: Company Mergerd, change the email domain to match that of an existing domain

              Originally posted by Sembee
              You don't really have many choices though. Exchange is designed to presume it is responsible for all email for a domain, which means that when it is not, you need a way to manage that.
              Sembee can you please elaborate on this?

              Thanks,
              Last edited by Sembee; 17th February 2010, 22:10. Reason: Quote corrected

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              • #8
                Re: Company Mergerd, change the email domain to match that of an existing domain

                There is not much more that I can say.
                Exchange presumes it is responsbile for all email for the domain by default. Therefore if you have email using the same domain on another unrelated server and you send email to someone on that other site then Exchange will bounce it if it doesn't match a user on your server (which it will not).

                Simon.
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                Simon Butler
                Exchange MVP

                Blog: http://blog.sembee.co.uk/
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                • #9
                  Re: Company Mergerd, change the email domain to match that of an existing domain

                  Thanks Sembee,

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                  • #10
                    Re: Company Mergerd, change the email domain to match that of an existing domain

                    Sembee, one more question,

                    All these configuration need to be done at exchange server with the new company at abc.com, do we have to do any thing at our exchange server at the old company at xyz.com??

                    Please reply,

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                    • #11
                      Re: Company Mergerd, change the email domain to match that of an existing domain

                      Ok Guys, when I created a recipient policy on my old company's exchange server for the new email domain, it applied to all the users and they had the secondary email address in the form of [email protected]

                      What I want is that they have their email address exactly like how they had their old email address, the reason is that I have in my old company email address starting from firstlater from the first name and last name @xyz.com or some of the addresses are first name and first initial of the last name @xyz.com.

                      Is there way, so that when I create new recipient policy on my exchange server at old company it gives the users same email name as their previous email name just domain is now the new domain,

                      One more thing when My users are going to reply to any emails how to make it possible so that reply address will show the new company's email address?

                      Thanks,

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                      • #12
                        Re: Company Mergerd, change the email domain to match that of an existing domain

                        If you want the email addresses to be the default, then you make the policy the default in Exchange. Recipient policy controls are limited.

                        http://support.microsoft.com/kb/822447

                        Simon.
                        --
                        Simon Butler
                        Exchange MVP

                        Blog: http://blog.sembee.co.uk/
                        More Exchange Content: http://exchange.sembee.info/
                        Exchange Resources List: http://exbpa.com/
                        In the UK? Hire me: http://www.sembee.co.uk/

                        Sembee is a registered trademark, used here with permission.

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                        • #13
                          Re: Company Mergerd, change the email domain to match that of an existing domain

                          OK, Now We have SMTP address space shared between the two domain and receipient policy applied correctly, and all the mail flow is working good, in and out.

                          However some of my users are getting the bounced back emails with the following error

                          Could not deliver the message in the time limit specified. Please retry or contact your administrator #4.4.7
                          After some troubleshooting I assume that it may be occuring because of reverse DNS check, as now all my user have Primary smtp address is of that new domain @abc.com

                          I was thinkig of changing the fully qualified domain name on my SMTP server property so that it will read server.abc.com (new domain name) right now I have server.xyz.com (old domain name)

                          Is this some thing I should be able to do it?

                          Please help,

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                          • #14
                            Re: Company Mergerd, change the email domain to match that of an existing domain

                            Your ISP should be able to do that for you, they'll almost certainly tell you to use their smarthost for mail delivery instead though based on my usual experiences with ISPs.
                            BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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                            • #15
                              Re: Company Mergerd, change the email domain to match that of an existing domain

                              The reverse DNS on your IP address and server SMTP banner has nothing to do with the email address of the user. There is simply not enough IP addresses in the world for each domain to have its own.

                              As long as the SMTP banner matches the PTR record on the IP address, which also resolves to that IP address then it can be anything you like. There is NOTHING in that NDR that you have posted to indicate that it is a problem with the reverse DNS and I cannot see how you have come to that conclusion. If a site was rejecting your email on that basis they should send back an NDR that says so, not the generic cannot deliver NDR.

                              Simon.
                              --
                              Simon Butler
                              Exchange MVP

                              Blog: http://blog.sembee.co.uk/
                              More Exchange Content: http://exchange.sembee.info/
                              Exchange Resources List: http://exbpa.com/
                              In the UK? Hire me: http://www.sembee.co.uk/

                              Sembee is a registered trademark, used here with permission.

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