How to remove the default "Mailspring" label from emails

I am having trouble removing this label that appears by default when we add a new email to Mailspring. It is called “Mailspring” and I can’t remove it. When I hit delete it just comes back. The same happens if I delete it directly from my e-mail provider, a while later it comes back.

Does anyone who has experienced this know how to solve it? I don’t want this label to be created.