How to share an SMTP address space in Exchange 2000 Server or in Exchange Server 2003

Method 1: Share the same SMTP address space with a different e-mail system

1. In Exchange System Manager, right-click the recipient policy, and then click Properties.
2. Click the E-Mail Addresses (Policy) tab, click an e-mail address, and then click Edit.
3. If the This Exchange Organization is responsible for all mail delivery to this address check box is selected, Exchange is authoritative for the SMTP address space. If this check box is not selected, Exchange is non-authoritative for the SMTP address space.

Step 1: Modify the primary SMTP address for the default recipient policy

1. Start Exchange System Manager, click Recipient Policies, right-click Default Policy, and then click Properties.
2. In the Default Policy Properties dialog box, click the E-Mail Address (Policy) tab, and then click New.
3. In the New E-mail Address dialog box, click SMTP Address, and then click OK.
4. In the SMTP Address Properties dialog box, type the SMTP address space for which you want Exchange to be authoritative. For example, type @example.local.
5. Click to select the This Exchange Organization is responsible for all mail delivery to this address check box, and then click OK.
   
   Note The e-mail address space that you specified must be stamped on all e-mail-enabled objects in Active Directory. In particular, this e-mail address space must be stamped on user accounts that have mailboxes. This enables the users to access the Outlook Web Access virtual server.
6. Click the new SMTP address that you created, and then click Set as Primary.
7. Remove the SMTP address that you want to share from the default recipient policy. To do this, click the SMTP address that you want to share, and then click Remove.

1. Right-click the mailbox manager policy, and then click Change property pages.
2. Make sure E-Mail Addresses is selected, and then click OK.
3. Right-click the mailbox manager policy, and then click Properties.
4. On the E-Mail Address (Policy) tab, select the shared SMTP address, and then click Edit.
5. Click to clear the This Exchange Organiation is responsible for all mail delivery to this address check box.
6. Perform step 5 for all Mailbox Manager Policies in the Recipient Policies container.

Step 2: Configure the shared SMTP address space

1. Create a new recipient policy for the shared SMTP address space. To do this, right-click Recipient Policies, point to New, and then click Recipient Policy.
2. In the New Policy dialog box, click to select the E-Mail Address check box, and then click OK.
3. In the Properties dialog box, type a name for the new recipient policy, click Modify, and then click OK.
   
   Note This configures the default LDAP filter for the policy. You can also modify this filter as appropriate for your environment.
4. When you receive the following message, click OK:
   When a recipient policy filter changes it does not mean that the proxy addresses for recipients who may no longer be under the control of the policy will be automatically re-evaluated. For these recipients to receive proxies from the new policies to which they belong, use 'Apply this policy now' on the policies that now affect these recipients.
5. Click the E-Mail Addresses (Policy) tab, and then click New.
6. Click SMTP Address, and then click OK.
7. In the Address box, type the SMTP address space that you want to share. For example, type @example.com, or type @microsoft.com.
8. Click to clear the This Exchange Organization is responsible for all mail delivery to this address check box, and then click OK.
9. Click the new SMTP address that you created, and then click Set as Primary.
10. Click OK, and then click Yes when you receive the following message:
    The e-mail Addresses of type(s) [SMTP] have been modified. Do you want to update all corresponding recipient e-mail addresses to match these new address(es)?

Step 3: Modify the SMTP virtual server properties to remove message forwarding for unresolved recipients

1. In Exchange System Manager, expand Administrative Groups, expand Administrative Group Name, expand Servers, expand ServerName, expand Protocols, expand SMTP, and then click the corresponding SMTP virtual server.
2. Right-click Default SMTP Virtual Server, and then click Properties.
   
   Note You may have to expand SMTP Virtual Servers before you can click Default SMTP Virtual Server.
3. Click the Messages tab.
4. Delete any entries that are displayed in the Forward all mail with unresolved recipients to host box, and then click OK.

Step 4: Configure an SMTP connector for the shared SMTP address space

1. In Exchange System Manager, right-click Connectors, point to New, and then click SMTP Connector.
2. In the Properties dialog box, type a name for the new connector in the Name box.
3. Click Forward all mail through this connector to the following smart hosts, and then type the host name of the destination computer or the IP address of the destination computer. You must type square brackets ([ ]) around the host name or IP address. For example, if the IP address of the destination computer is 192.168.1.10, type [192.168.1.10].
   
   This computer will receive all e-mail that is not resolved to objects in Active Directory.
4. Click Add, click an Exchange server in the Add Bridgehead dialog box, and then click OK.
5. Click the Address Space tab, click Add, click SMTP in the Add Address Space dialog box, and then click OK.
6. In the Internet Address Space Properties dialog box, type the shared SMTP address space in the E-mail domain box. When you type the shared SMTP address space, do not include the at (@) symbol. For example, type example.com in the E-mail domain box. Then, click OK.
7. Click to select the Allow messages to be relayed to these domains check box.
   
   Note Because Exchange must also receive messages for the shared e-mail address space, you must let Exchange relay messages to this domain. This setting lets all the SMTP virtual servers that are listed under Local bridgeheads on the General tab accept messages for the shared e-mail address space.
8. Click OK.

Step 5: Restart the Routing and SMTP services

1. In the Services snap-in, click Start, click Run, type services.msc, and then click OK.
2. Right-click Microsoft Exchange Routing Engine, and then click Stop.
3. Right-click Microsoft Exchange Routing Engine, and then click Start.
4. Right-click Simple Mail Transport Protocol (SMTP), and then click Stop.
5. Right-click Simple Mail Transport Protocol (SMTP), and then click Start.
6. Exit the Services snap-in.

Method 2: Share the SMTP address space by using contacts to redirect e-mail to a remote e-mail system

1. When a user from the remote e-mail system sends an e-mail message to the Internet, the domain part of the reply address will correspond to the secondary SMTP e-mail address of the contact in Active Directory.
2. When the user from the Internet replies, the message is routed to the Exchange server.
3. When Exchange receives the message, Exchange resolves the e-mail address to the secondary SMTP address of the contact in Active Directory.
4. Exchange routes the message to the primary SMTP e-mail address of the Active Directory contact. This is the targetAddress of the contact. Therefore, the e-mail message is routed to the remote e-mail system.

Step1: Configure recipient policies for use with contacts

1. In Exchange System Manager expand Recipients, right-click Recipient Policies, point to New, and then click Recipient Policy.
2. In the New Policy dialog box, click to select the E-Mail Addresses check box, and then click OK.
3. In the Properties dialog box, type a name for the recipient policy, and then click Modify.
4. In the Find Exchange Recipients dialog box, click to clear all the check boxes that appear on the General tab, and then click OK.
5. When you receive the following error message, click OK:
   You must select at least one recipient type.
   
   ID no: c103a06e
   Microsoft Active Directory - Exchange Extension
6. When you receive the following message, click OK:
   When a recipient policy filter changes it does not mean that the proxy addresses for recipients who may no longer be under the control of the policy will be automatically re-evaluated. For these recipients to receive proxies from the new policies to which they belong, use 'Apply this policy now' on the policies that now affect these recipients.
7. Click the E-Mail Addresses (Policy) tab, and then click New.
8. In the New E-mail Address dialog box, click SMTP Address, and then click OK.
9. In the SMTP Address Properties dialog box, type SMTP domain of the remote e-mail system in the Address box. You must include the at symbol (@) in the Address box when you type the SMTP domain. For example, if the remote SMTP domain is example.com, type @example.com in the Address box. Then, click OK.
10. Click to clear the This Exchange Organization is responsible for all mail delivery to this address check box, and then click OK.
11. Click to select the check box of the new SMTP domain that you created in step i.
12. Follow steps g through k to create additional SMTP domains if you have additional remote SMTP domains.
13. Click OK, and then click No when you are prompted to update recipient e-mail addresses.

Step 2: Add contacts to Active Directory to represent remote users

• By using the Active Directory Users and Computers tool
• By using the Csvde.exe tool
• By using the Ldifde.exe tool
• By adding the contacts programmatically

objectClass,dn,name,cn,sn,givenName,displayName,proxyAddresses,targetAddress,mail,mailnickname
contact,"cn=Internet User,ou=internet users,dc=xo,dc=one",Internet User,Internet User,User,Internet,Internet User,SMTP:internetUser@remote.domain; smtp:internetuser@xo.one,SMTP:internetUser@remote.domain,internetUser@remote.domain,internetuser

Step 3: Modify the SMTP virtual server properties to remove message forwarding for unresolved recipients

1. In Exchange System Manager, expand Administrative Groups, expand Administrative Group Name, expand Servers, expand ServerName, expand Protocols, expand SMTP, and then click the corresponding SMTP virtual server.
2. Right-click Default SMTP Virtual Server, and then click Properties.
   
   Note You may have to expand SMTP Virtual Servers before you can click Default SMTP Virtual Server.
3. Click the Messages tab.
4. Remove any entries that are displayed in the Forward all mail with unresolved recipients to host box, and then click OK.

Step 4: Create an SMTP connector to route e-mail to the remote e-mail system

1. In Exchange System Manager, right-click Connectors, point to New, and then click SMTP Connector.
2. In the Properties dialog box, type a name for the new connector in the Name box.
3. Click Forward all mail through this connector to the following smart hosts, and then type the host name of the destination computer or the IP address of the destination computer. You must type square brackets ([ ]) around the host name or the IP address. For example, if the IP address of the destination computer is 192.168.1.10, type [192.168.1.10].
   
   This computer will receive all e-mail that is not resolved to objects in Active Directory.
4. Click Add, click an Exchange server in the Add Bridgehead dialog box, and then click OK.
5. Click the Address Space tab, click Add, click SMTP in the Add Address Space dialog box, and then click OK.
6. In the Internet Address Space Properties dialog box, type the shared SMTP address space in the E-mail domain box. When you type the shared SMTP address space, not include the at (@) symbol. For example, type example.com in the E-mail domain box. Then, click OK.
7. Click to select the Allow messages to be relayed to these domains check box.
   
   Note Because Exchange must also receive messages for the shared e-mail domain, you must let Exchange relay messages to this domain. This setting lets all the SMTP virtual servers that are listed under Local bridgeheads on the General tab accept messages for the shared e-mail domain.
8. Click OK.
9. Follow steps a through h to create one SMTP connector for each remote SMTP e-mail domain.
   
   Note If one remote e-mail server routes e-mail for all the remote SMTP e-mail domains, you only have to add all the remote SMTP domains to the Address Space tab of a single SMTP connector.

Step 5: Restart the Routing and SMTP services

1. In the Services snap-in, click Start, click Run, type services.msc, and then click OK.
2. Right-click Microsoft Exchange Routing Engine, and then click Stop.
3. Right-click Microsoft Exchange Routing Engine, and then click Start.
4. Right-click Simple Mail Transport Protocol (SMTP), and then click Stop.
5. Right-click Simple Mail Transport Protocol (SMTP), and then click Start.
6. Exit the Services snap-in.

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