thaxor

So by default if you’re running a single server Exchange solution such as SBS then your server is configured not to accept “anonymous” connections. In other words, devices that aren’t authenticated with the domain can’t send email (with the exception of other Exchange servers. This will stop *nix boxes or multifunction devices like copiers from sending emails.

Run this command from the Exchange management shell to allow anonymous connections.

Set-ReceiveConnector -Identity “Default <insert server name>” -PermissionGroups “AnonymousUsers”