Would you trust some company that asks for your full email access and says they will only access your email headers for the sake of filtering out the junk?

Reference: [https://www.sanebox.com/help/223-privacy-security-can-sanebox-read-my-email](https://www.sanebox.com/help/223-privacy-security-can-sanebox-read-my-email)

My thought is that I really would be able to tell from my side if they access my full email, including the email body and attachment or if they only accessed the email header as they claim.

access email headers privacy trust