How to allow relay through Exchange 2007

Step by step guide to allowing relay

To allow individual systems to relay mail through your Exchange 2007 system, perform the following steps:

1. Start the Exchange Management Console.

2. Browse to Microsoft Exchange > Server Configuration > Hub Transport.

3. Select the Hub Transport server through which you would like to allow another system to relay mail.
4. From the Actions pane, choose New Receive Connector (Figure A). Figure A
5. On the first page of the New SMTP Receive Connector wizard, type a name for the connector and choose the connector’s intended use. In this case, choose Custom (Figure B). Figure B Choose a use for this connection
Type a name and choose a use for this connector.

6. Choose Next.

7. On the Local Network Settings page, click the Add button
8. On the Local Network settings page, click the Add button and, in the Add Receive Connector Binding window, type in the new IP address that you gave to the network adapter. Leave the SMTP port at 25 (Figure C).
9. Choose OK.

10. Under Local IP address(es), select All Available and click the red X to delete this selection.
Figure C
Determine local IP address and port

Decide which IP address and port combination to use for the new connector.

11. Choose Next.
12. On the Remote Network Settings window, indicate which systems or range of IP addresses should be allowed to relay through this connector. In the example shown in Figure D, the host system with IP address and any system with an IP address in the range to will be allowed to relay through this connector. Figure D
Choose system with rights to relay

Indicate the systems with rights to relay through this connector.

13. Choose Next.

14. On the summary screen, click the New button to create the connector.

15. Open the properties page of the new connector. To do so, right click the new connector and choose Properties.
16. From the connector’s Properties page, choose the Permission Groups tab (Figure E).
17. Select the checkbox next to “Exchange Servers”.
Figure E
Select Exchange servers

Select Exchange Servers. You must do this before you continue.
18. From the connector’s Properties page, choose the Authentication tab (Figure F).
19. Select the checkbox next to “Externally Secured (for example, with IPsec)”.
Figure F
Select External Secured

Select External Secured to tell Exchange that the third party device somehow manages it own permissions.

20. Choose OK.

At this point, you should be able to relay from the third party system.