Orange Error Box Support Page Inadequate

A prospective client was kind enough to let me know she got an error when trying to schedule an appointment on my website. I tested it with an alias email, i.e. [email protected], and sure enough I got an error.

So I tried to find the resolution to the orange “spam” error box, but the CF7 page doesn’t tell me how to fix it. There is a vague mention of something called Flamingo, but no list of steps for what I actually need to do. Does anyone know what these steps are?

Please and thank you.