You can configure Secure Ad Hoc Transfer to block (Blacklist) or allow (Whitelist) only specific domains. For example, if you do not want users to send files to certain e-mail accounts, you would add that domain to the blacklist.
To configure the blacklist and whitelist
Open the Internet Information Services manager. (Click Start, Programs > Administrative Tools > Internet Information Services (IIS) Manager.)
Expand the Web Sites node, then expand the Default Web Site node.
Right-click EFTAdHoc, then click Properties.
In the Properties dialog box, click the ASP.NET tab. (If the Properties dialog box does not have an ASP.NET tab, refer to AdHoc Properties Missing ASP.NET Tab.)
Click Edit Configuration. The ASP.NET Configuration Settings dialog box appears
Click the General tab. The settings in the web.config file for the SAT Module appear in the Application settings area.
Scroll to BlacklistDestinationDomain, click it, then click Edit.
In the Edit/Add Application Settings dialog box, type the domain or string to block from being used in the To, Cc, or Bcc boxes in the SendMail form, then click OK. Separate multiple domains with commas.
Scroll to WhitelistDestinationDomain, click it, then click Edit. By default all domains (*) are allowed.
In the Edit/Add Application Settings dialog box, type the domain or string to allow in the To, Cc, or Bcc boxes in the SendMail form, then click OK. Separate multiple domains with commas.
Click OK to close the ASP.NET Configuration Settings dialog box.
Customizing the Secure Ad Hoc Transfer Web Interface
Customizing the Notification E-Mail
Configuring Temporary User Account Expiration