Exchange 2003, Swing Migration, Smart Host

Posted on 2007-07-25
Last Modified: 2010-03-06
Exchange 2003, Swing Migration

According to:

Smart Host Configuration on the "Default SMTP Virtual Server".
If you have configured an entry in the Smart Host box then you need to remove it and replace it with an SMTP Connector. Exchange uses SMTP to communicate between the servers. Using a Smart Host on the "Default SMTP Virtual Server" will stop the messages going between the servers.

So, there is one SMTP Virtual Server on the old server. There is a Smart Host configured (
Under routing groups, there is a custom one (say, and Default... which of course says forward all mail to smart host as above.

If I remove the smart host per the article, what becomes of mail flow, or am I missing a step? What do I need to do for prep here?
Question by:SpottedBunny
    LVL 104

    Expert Comment

    I don't see what isn't clear about what I wrote (that article is mine).
    You are simply changing the smart host from being on the SMTP virtual server to an SMTP Connector. If you have a custom SMTP connector which is trying to send email another route then at present it isn't working correctly. A smart host on the SMTP VS forces all email to go to that smart host, no matter what else you have set.


    Author Comment

    This will clarify for me...

    Protocols > SMTP > Default SMTP > Delivery > Advanced > 'Smart host' =

    I am to delete that entry.

    Routing Groups > Connectors > Default > Forward all mail through following smart hosts... =
    ...OtherRoutingGroup > Forward all mail through following smart hosts... =

    I leave those two entries above... until I recreate them at the end on the new server, and decommission the original?
    LVL 104

    Accepted Solution

    SMTP Connectors are not server specific. They are an Org wide setting. You will not have to recreate them at all.
    Simply remove the smart host from the SMTP virtual server - you already have the setting on an SMTP Connector.


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