GMAIL - Filtering SPAM google forms?

[Bev]

We are getting quite a lot of Google Forms spam from adult websites. They are all picked up by the Spam filter and end up in quarantine, but I would like to just block them altogether as I am having to check the quarantine multiple times a day. I have the actual adult websites setup on a blocked domain list, so the emails don't even make it to quarantine, but I can't block anything from google forms, as we use it quite often in school.

 

Any suggestions on how I can filter these out? Something like GoogleForms + Spam Filter means delete automatically, Google Forms without Spam Filter is ok ?