Thanks, I just adjusted. Did not know that applied to the Mailgun extension.
Also, is there shortcode for unsubscribing? In my emails, I was directing subscribers to their Newsletter Profile page with the [newsletter_profile] shortcode. I didn't realize that this does not offer an option to unsubscribe. The only way I know for subscribers to unsubscribe is putting the tag {unsubsription_url} in the email.