Would email be more likely be treated as spam if the sender's email domain not an branded domain? we did setup the DKIM & SPF settings & got verified the issue is email is landing on spam folder.
Please move the thread to the correct space, Products: https://nation.marketo.com/t5/Products/ct-p/products
This space, "Customer Care" is not a support space. It's for finding your account rep info and things like that.