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How to configure
ISA
Server for Outbound Mail
A. Creating an SMTP Access Rule
To enable outbound SMTP connections from your network,
create an access rule on ISA Server that allows outbound SMTP traffic:
1. In the Microsoft ISA Server Management console tree, select Firewall
Policy.
2. In the task pane, on the Tasks tab, select Create New Access Rule to
start the New Access Rule Wizard.
3. On the Welcome page of the wizard, enter the name for the access rule,
such as Outbound SMTP, and then click Next.
4. On the Rule Action page, select Allow, and then click Next.
5. On the Protocols page, in This rule applies to, select Selected protocols
and then use the Add button to open the Add Protocols dialog box.
6. In the Add Protocols dialog box, expand Mail, and select SMTP. Click Add,
and then click Close, to close the Add Protocols dialog box. On the
Protocols page, click Next.
7. On the Access Rule Sources page, click Add to open the Add Network
Entities dialog box, expand Networks, select Internal, click Add, and then
click Close.
8. On the Access Rule Sources page, click Next.
Note: You can limit the access rule sources to a computer set containing the
Exchange servers that handle outbound mail. If you have configured an SMTP
connector on Exchange to handle all outbound mail, only that Exchange server
would have to be listed (as a Computer network object) in the access rule
sources.
9. On the Access Rule Destinations page, click Add to open the Add Network
Entities dialog box, expand Networks, select the External network
(representing the Internet), click Add, and then click Close. On the Access
Rule Destinations page, click Next.
10. On the User Sets page, you can specify the set of users whose
credentials are used by the Exchange servers that require access, or you can
leave the default user set All Users. If you want to specify a specific user
set, select All Users and click Remove. Then, use the Add button to open the
Add Users dialog box, from which you can add the user set to which the rule
applies. The Add Users dialog box also provides access to the New User Sets
Wizard through the New menu item. When you have completed the user set
selection, click Next.
11. Review the information on the wizard summary page, and then click
Finish.
12. In the Firewall Policy details pane, click Apply to apply the new access
rule. It may take a few moments for the rule to be applied. Remember that
access rules are ordered, so if a deny rule matching SMTP access requests
exists ahead of this allow rule in the order, access will be denied.
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