From a newsgroup post: "If after sending out a fax you cannot receive e-mail receipts delivery, see my steps below to troubleshoot this problem:
1. Open Exchange System Manager, expand to Servers\<server name>\Protocols\SMTP, right click "Default SMTP Virtual Server" and choose Properties.
2. On the General page, click the Advanced button. Remember the TCP port the virtual server is using. By default, it should be port 25.
3. Click the Access tab. Click the Authentication button. Make sure the default SMTP virtual server is using the following authentication methods:
-Anonymous access ("Resolve anonymous e-mail" unchecked).
-Basic authentication ("Requires TLS encryption" unchecked and "Default domain" blanked).
-Integrated Windows Authentication.
4. Click the Connection button. Make sure "All except the list below" is selected and the server's IP including 127.0.0.1 is not on the list.
5. Click the Relay button. Make sure "Only the list below" is selected and the following are listed (I assume your internal subnet is 192.168.0.2/255.255.255.0):
Granted External IP Address (if you have 2 network adapters).
Also make sure "Allow all computers which successfully authenticate ..." is selected.
6. Restart the Default SMTP Virtual Server.
7. Open Server Management Console, right-click "Fax (Local)", and then click "Properties".
8. Click the "Receipts" tab.
9. Click to select "Enable SMTP e-mail receipts delivery". Uncheck "Enable message boxes as receipts" if it is selected.
10. In the "From e-mail address" box, type the e-mail address that you want the e-mail receipt messages to come from. For example, if you want the Administrator account's e-mail address to be on the From line in the e-mail receipt messages, type Administrator@Your-Email-Domain.com. The default setting is SBSFaxServ...@Your-Email-Domain.com.
11. In the "Server address" box, type the SBS server's NetBIOS computer name. Do not type the server's fully qualified domain name (FQDN, for example, ServerName.DomainName.local). To determine the SBS server's NetBIOS computer name, open a Command Prompt window, type "hostname" (without the quotation marks), and then press enter.
12. In the "Port" box, type the port we found at step #2. By default, it is "25" (without the quotation marks).
13. Click the Authentication button and make sure "Anonymous access" is selected.
14. Click to select "Use these SMTP settings the Route Through E-mail incoming routing method", and then click "OK".
15. Restart the Fax service (right click "Fax (Local)" and choose Stop, then right click it and choose Start) and check if you can receive email notifications. For more information, see ME311529