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Exchange 2010 with multiple domains

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  • Exchange 2010 with multiple domains

    I have an SBS2011 server running the latest version of Exchange. My current setup is an MX record that sends email to IP 123.123.123.123 and a subsequent PTR record that goes in reverse.

    I have setup another two domains as authorative domains and have been using SBS POP3 connector to use them but due to a sudden increase of users for those domains, I would like to make them "exchange complliant".

    My idea is to change the MX records for each domain to 123.123.123.123 and use the webhost as a backup with a higher priority to ensure some redundancy. How would I go about setting up the PTR for the new domains though?

    From my understanding you can only have one PTR per IP.

    To summarise:

    Primary domain: MX record ->123.123.123.123 PTR-> domainname ->123.123.123.123 (which works fine)
    secondary domain: MX record->123.123.123.123 PTR->?

  • #2
    You are talking about public domains, not internal domains. Its much easier than that.

    You have domain1.com and your mx is mail.domain1.com
    ​​​
    you want to receive mail for domain2.com. you do NOT need to make a mx of mail.domain2.com, you can just create an mx record for domain2 pointing to mail.domain1.com

    Now, you will still need to get the autodiscover working properly which means either getting a cert with all of the names or setting up an http redirect site.

    Hope that helps.

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