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Question You are subscribed to this thread Applies to Windows Other/Unknown Email and communications 2 views Sending an internal unresolvable email to the internet for resolution

    Question

  • Hey everyone,

    In the middle of a complex mess and hoping the experts can chime in. Here's the scenario;

    You have one company that has split into two separate companies; ABC.com and ABC.com (yes, they have to stay this way for a few months)

    We need to split the exchange servers into two. One will have half of the company, the other exch server will have the other half.

    Both exch servers cannot be connected to each other. Neither can know the other exists.

    John@abc.com lives on one side, Mary@abc.com lives on the other side.

    An external mail spam filter receives all @abc.com mx traffic and handles the routing internall between both

    John needs to email Mary, but can't because the exch server that John lives in doesn't see Mary because she lives on another abc.com exch server that John's doesn't know about.

    So here's the question;

    Can John's exch send Mary's email out to the internet after realizing it can't resolve Mary internally? 

    Exchange 2010 SP2

    Monday, October 26, 2015 9:41 PM

Answers

  • Hi,

    I notice that these two Exchange servers are still using the same domain and SMTP address. I suggest we can create Address Book Policies for two separate companies respectively to achieve GAL segmentation.

    In your scenario, we can create the address lists and GALs based on filters, such as Custom Attributes, that grouped the objects logically. For detailed information about this, please refer toScenario 1: Two Separate Companies - One Exchange Organization part in the following article:

    https://technet.microsoft.com/en-us/library/hh529948(v=exchg.141).aspx

    When John@abc.com who lives on one company sends message to Mary@abc.com who lives on the another company, the message would be send as internal message though Mary is not in the GAL of John company. Because both John and Mary are still in the same organization and same domain.

    Regards,


    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Winnie Liang
    TechNet Community Support

    Tuesday, October 27, 2015 7:41 AM
    Moderator

All replies

  • Hello

    tip: https://technet.microsoft.com/en-us/library/bb676395(v=exchg.141).aspx
    or create contacts  add external email address like jhon@ab1.corp and other exchange mary@ab2.corp  and config spam filter where is two domain. add ab1.corp and ab2.corp to accepted domain in exch server and add additional emaileaddress to users @ab1.corp and ab2.corp.


    sorry my english

    Tuesday, October 27, 2015 6:23 AM
  • Hi,

    I notice that these two Exchange servers are still using the same domain and SMTP address. I suggest we can create Address Book Policies for two separate companies respectively to achieve GAL segmentation.

    In your scenario, we can create the address lists and GALs based on filters, such as Custom Attributes, that grouped the objects logically. For detailed information about this, please refer toScenario 1: Two Separate Companies - One Exchange Organization part in the following article:

    https://technet.microsoft.com/en-us/library/hh529948(v=exchg.141).aspx

    When John@abc.com who lives on one company sends message to Mary@abc.com who lives on the another company, the message would be send as internal message though Mary is not in the GAL of John company. Because both John and Mary are still in the same organization and same domain.

    Regards,


    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Winnie Liang
    TechNet Community Support

    Tuesday, October 27, 2015 7:41 AM
    Moderator