In an enterprise, there may be several distinct Exchange
organizations and other e-mail systems that share their Simple Mail Transfer
Protocol (SMTP) domain. This article describes how to centralize incoming and
outgoing e-mail in such an enterprise. To centralize e-mail, you use an
Exchange organization as a mail hub. To do this, you set up mail-enabled
Microsoft Windows 2000 contacts with the primary SMTP-address for the shared
SMTP domain, different SMTP target addresses, and selective SMTP connectors for
If you have multiple e-mail organizations that
share a common domain, you may want a centralized mail hub for inbound and
outbound SMTP traffic.
You may want all e-mail to leave the enterprise
with a consistent mail address of @organization.org. You may want all incoming
e-mail for the SMTP address @organization.org to be centrally queued and
correctly routed to the appropriate e-mail organization. For example, imagine
the following situation:
- E-mail hub Exchange 2000 Organization A with main SMTP address @organization.org.
- Exchange 5.5 Organization B with main SMTP address @organization.org.
- Acquired Exchange 5.5 Organization C with main SMTP address @acquired.org.
- UNI- based e-mail Organization D with main SMTP address @organization.org.
To set up the Organization A as a SMTP mail hub for the
whole enterprise and a consistent mail addressing with @organization.org,
follow these steps:
- Create the following SMTP addresses:
- @subb.organization.org for mail recipients in
- @subc.organization.org for mail recipients in
- @subd.organization.org for mail recipients in
- Set up a Recipient Policy in Organization A with an address
space of @organization.org. Make sure that the This Exchange
Organization is responsible for all mail delivery to this address
check box is selected.
- For each mail recipient that is in the enterprise but
outside organization A, set up a Windows 2000 contact with:
- The primary SMTP address of
- A target address of
NOTE: You can set up a target address of the Windows 2000 contact,
different from the primary SMTP address of the contact in Active Directory
Users and Computers only with Exchange Server 2000 Service Pack 2. For more
309212 For Exchange Server 2000 pre-SP2, you can change
the target address of the contact through ADSIEdit or LDP tools from the
Windows 2000 Support Tools on the Windows 2000 Server CD.
XADM: Cannot Set Secondary Address as Primary on a Contact
- For every subx.organization.org, set up an SMTP connector
with the address space of subx.organization.org. Set the routing appropriately,
either to a smart host for these subdomains in these other mail organizations,
or through an internal DNS solution.
- Set up appropriate SMTP connectors with all SMTP address
spaces that are accepted for your enterprise (for example, the address space
@aquired.org for mail organization C). Set the routing appropriately either to
a smart host for these subdomains in these other mail organizations or through
an internal DNS solution.
- To centralize outbound SMTP traffic through Exchange 2000
Organization A, you must set up the appropriate mail connectivity from
Organizations B through D to Organization A. Because the main SMTP-address of
the Windows 2000 contacts is @organization.org, recipients in the Organizations
B through D appear outbound with this SMTP address.
information about setting up mail-enabled Windows 2000 contacts, click the
following article number to view the article in the Microsoft Knowledge Base:
XADM: How to Configure a Mailbox to Forward Mail to a Mail-Enabled Contact
For additional information about adding
secondary SMTP-Proxy addresses in bulk for Exchange 5.5 organizations, click
the following article number to view the article in the Microsoft Knowledge
XADM: How to Change the Default SMTP Address for the Domain and Keep the Original as a Secondary
Article ID: 315511 - Last Review: October 28, 2006 - Revision: 1.5
- Microsoft Exchange 2000 Enterprise Server