My last use of FogBugz was in 2012. After replying to FogBugz's fake bill, I noticed an auto-reply in my gmail spam:

Title: "Notification - Please visit support team"

Sender: "Sales and Success"

The short body declares that I have to go to their support portal.

I can't tell whether this stems from incompetence or if their aiming for Spam on purpose. Given their behavior, I assume the latter.