Try adding the domain to the 'Spam Sender Whitelist' or to the 'Trusted Senders' list. The first one seems like it should work for you. Add the domain as '*@domain.tld' and give that a shot. Here is an excerpt from the help for that page: If you need to make exceptions to spam scanning, you can use the Spam Sender Whitelist function to add addresses or user/domain patterns.
