RewriteEngine on

RewriteCond %{HTTP_HOST} ^promotion\.creditexa\.com$ [OR]
RewriteCond %{HTTP_HOST} ^www\.promotion\.creditexa\.com$
RewriteRule ^/?$ "http\:\/\/tracking\.affiliatevia\.com\/aff_c\?offer_id\=256\&aff_id\=1003\&aff_sub\=promotion007" [R=301,L]