Change SBS 2003 Exchange 2003 logon banner

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How do I change the Exchange logon banner?
I recently had an internet port scan vulnerability test performed and the
results were very good, although not even considered a low risk, but just
informational, there was a suggestion for a solution as follows:
SMTP Server type and version
This detects the SMTP Server's type and version by connecting to the server
and processing the buffer received.
This information gives potential attackers additional information about the
system they are attacking. Versions and Types should be omitted
where possible.

Solution: Change the login banner to something generic (like:
'welcome.')Remote SMTP server banner :
220 "mydomain".com Microsoft ESMTP MAIL Service, Version: 6.0.3790.211 ready
at Wed, 30 Mar 2005 20:29:33 -0600

Thanks,

Bob


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