403 redirect to home

Hello,

I have mapped an old domain to Zoho CRM. I have many old backlinks pointing to old pages not more existing.
It would be great if I could redirect these pages (actually giving 403 error) to the home.

I have tried with "301 redirect" tool in SEO section of my dashboard but unfortunately does not work. Anybody knows how to pproceede to a global 403 error redirect?

Thank you