Simple .htaccess to redirect all requests to another domain

Name this file .htaccess and place it in the root directory of the domain you want to redirect from.

Replace my-new-domain.com with the domain you want to redirect to. (remember in the RewriteCond line, the . in the domain needs to be escaped with a backslash!)

RewriteEngine On
RewriteCond %{HTTP_HOST} !^my-new-domain\.com$ [NC]
RewriteRule ^(.*)$ https://my-new-domain.com/$1 [L,R=301]