If you have the same structure as your old domain i.e. old.com/xyz ... and new.com/xyz then you can use .htaccess redirect

RewriteEngine on
RewriteCond %{HTTP_HOST} ^old\.com$ [NC]
RewriteRule ^(.*)$ http://www.new.com/$1 [R=301,L]

OR

If you just want to redirect all links straight to your new domain. you can use 

RewriteEngine on
RewriteCond %{HTTP_HOST} ^old\.com$ [NC]
RewriteRule ^(.*)$ http://www.new.com/ [R=301,L]