Still after white listed my domain and email address - it's going to the spam folder

Still after white listed my domain and email address - it's going to the spam folder

I have my website where I have my "contact form" and that web/domain forwarding all questions/inquires to my zoho email. But somehow those emails going straight to the 'spam'. How can i fix it? 

I've read your hints and I did exactly you show, to add that specific domain and email address to white list, but Is just doesn't work! Still emails going to 'spam'. What is the solution for this?