What is meant by "dummy content" when approving my email?

I have written my first email in Pabbly, but it needs to be approved before I can send it.

I received a reply from Pabbly stating that my email requires some changes because it’s not yet considered "legitimate."
They mentioned: "Avoid using dummy content in your emails." My email is in Dutch, so I’m wondering if that might be the issue, or if they mean something else by "dummy content." Could someone explain what Pabbly means by "dummy content" and how I can fix this?

Thanks in advance for your help!

Hey,

Your campaign seems to be approved, can you please check again?