Yeah, this happens. That's why it says the following on the front page: "The email sent by this system contains numerous unusual tricks which will probably off

Yeah, this happens. That's why it says the following on the front page: "The email sent by this system contains numerous unusual tricks which will probably offend some spam filters. If possible, you may want to whitelist emails from sender addresses matching *@emailprivacytester.com before continuing." If you don't have that level of control, I'm not sure what you can do about it.