Updated June 5, 2006
Iron Speed Designer V3.2 and V4.0
Configure these components to enable email server authentication on your system:
Your application’s Web.config file.
SMTP server on your system to allow relaying to itself.
Step 1: Locate the Web.Config file for your application, e.g.:
C:\Applications\MyApp\Web.config
Step 2: In Web.Config, modify the following line:
<add key="EmailServer" value="mymailserver" />
Replace “mymailserver” with either (a) your machine’s name or (b) the fully qualified domain name of your machine, e.g. computer or computer.mydomain.com.
By default, the Windows SMTP server does not allow relaying. In order for your application to send emails, you must enable relaying to the computer itself. This solution opens up relaying to the local server 127.0.0.1 only, so it is not open to everyone. The 127.0.0.1 is a local non-routable address that designates the machine you are using.
Step 1: Open the Microsoft IIS Console
Start -> Settings -> Control Panel -> Administrative Tools -> Internet Information Services
Step 2: On the left pane of the Microsoft IIS Console, expand the computer icon.

Step 3: Right click on "Default SMTP Virtual Server" and select Properties.

Step 4: In the Page Properties dialog, select the Access Tab.

Step 5: Select “Relay…”.

Step 6: In the Relay Restriction dialog, add the IP Address of your system. Make sure the "Only the list below" option is selected. This will effectively allow your machine to communicate with its own SMTP server so emails can be sent.

Step 7: Click OK to accept the changes.

Step 8: Click OK until you've closed all the dialogs.
Your application can now send emails.