Anti-Spam

This feature is vitally important if WinRoute, as an email relay server, is publicly available. In other words, if you have created a port mapping for TCP port 25 for incoming email. By default, WinRoute's SMTP relay will allow anyone to send email through WinRoute. The anti-spam feature will restrict users that can relay email through WinRoute. As stated within the interface, it does not restrict users from receiving undesired spam email.

The first option 'Users from IP addresses specified by address group' makes reference to any address groups you may have created from the settings -> advanced -> address groups. It is recommended that you create at least one address group that includes the IP range of your local area network. By enabling this option and referencing an address group, IP addresses defined in that group may relay through WinRoute. All other IP addresses will be denied the ability to relay through WinRoute.

If you have remote users that wish to relay through WinRoute, but have dynamic IP addresses that cannot be defined in an address group, it is necessary to enable the second option 'Users authenticated in SMTP session'. This will require users to specify a user name and password in their email client for sending email. Note that if both options are enabled, users with IP addresses defined within the address group will not need to authenticate, however they still may be configured to do so.