X400 SMTP Addresses , do we really need them?

Posted on 2010-01-01
Last Modified: 2012-08-14
In a typical Windows Server 2003 AD & Exchange 2003 environment , do we really need the X400 SMTP addresses that are generated by default for all users

As you know , The X400 SMTP entry is created by default with the default recepient policy

If not required , can we safely remove all X400 related entries?

Question by:Barwa
    LVL 3

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    Author Comment

    There is also 2 more entries under the default recepient policy named "GWISE" & "NOTES"

    Do we need them?
    LVL 58

    Accepted Solution


    Yes! Exchange 2000 and 2003 require the X.400 addresses to function correctly, and an X.400 address template should always be present on the Default Recipient Policy. Pure Exchange 2007 and 2010 environments with no 2000/2003 servers do not necessarily require the X.400 address to function, but as the address is already there, I would not suggest removing it.

    I had an issue last year where the X.400 address was removed from the Default Recipient Policy during an Exchange 2007 migration. This resulted in the services on the Exchange 2000 Server failing to start. I blogged about it at

    The GWISE and NOTES addresses are linked to Novell Groupwise and Lotus Notes/Domino Server. If you co-exist with these mail servers in your environment, or performed a migration from these environments to Exchange, I would not recommend removing those addresses.


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