***Forbidden*** / Yop Poll plugin

Good afternoon,

We want to start a survey within our website. We will do this via the YOP Poll plugin (https://yop-poll.com).

I created a survey: https://eigenwarmtebalk.frl/enquete-collectieve-actie/

However, some users cannot (now) send them. They receive the message: ***Forbidden***

Probably because of the Cleantalk spam filter? How can I exclude our survey/yop poll from the spam filter?

I would like to hear from you.

Tjeerd Engel