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For the external clients to access the email from the Internet, you can use the New Mail Server Rule Publishing Rule Wizard to publish two categories of external client access:

·        Web client access, including Outlook Web Access, Outlook Mobile Access, and Exchange Server ActiveSync.

·        Client access using the RPC, IMAP, POP3 and SMTP protocols.

A. Creating a New Mail Publishing Rule

To enable access by external clients, create a new mail publishing rule using the New Mail Server Publishing Rule Wizard.

1. Expand Microsoft ISA Server Management and click Firewall Policy.
2. On the Firewall Policy task pane on the Tasks tab, select Publish a Mail Server to start the New Mail Server Rule Wizard.
3. On the Welcome page of the wizard, provide a name for the rule, such as External Client Access, and then click Next.
4. On the Select Access Type page, select Client access: RPC, IMAP, POP3, SMTP, and then click Next.
5. On the Select Services page, select the protocols on which you want access to be possible. The secure ports are associated with the SSL-encrypted protocols: IMAPS, POP3S, and SMTPS.
6. On the Select Server page, provide the IP address of the Exchange server, and then click Next.
7. On the IP Addresses page, select the network on which ISA Server will listen for requests from external clients. Because you want to receive communication from the External network, select External, and then click Next.
8. On the Completing the New Mail Server Publishing Rule Wizard page, scroll through the rule configuration to verify that you have configured the rule correctly, and then click Finish.
9. In the ISA Server details pane, click Apply to apply the changes you have made. It will take a few moments for the changes to be applied.
10.  

B. Requiring Encryption on the RPC Rule

If you created a rule that publishes Exchange RPC Server (not RPC over HTTP, that requires encryption for Exchange RPC Server communication, follow these steps.

1.         Expand Microsoft ISA Server Management and click Firewall Policy.

2.        On the Firewall Policy details pane, double-click the Exchange RPC Server rule. The rule will have the name you provided in the New Mail Server Publishing Rule Wizard, appended with Exchange RPC Server, for example, External Client Access Exchange RPC Server.

3.        In the rule properties, select the Traffic tab, click Filtering, and select Configure Exchange RPC to open the Configure Exchange RPC Policy dialog box.

4.        Select Enforce Encryption, and then click OK.

5.        Click OK to close the rule properties page.

6.        In the ISA Server details pane, click Apply to apply the changes you have made. It will take a few moments for the changes to be applied.

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