Answered .htaccess & Addon domain

# Rewrite www.domain.com -> domain.com -- used with SEO Strict URLs plugin
#RewriteCond %{HTTP_HOST} .
#RewriteCond %{HTTP_HOST} !^example-domain-please-change\.com [NC]
#RewriteRule (.*) http://example-domain-please-change.com/$1 [R=301,L]
#
# or for the opposite domain.com -> www.domain.com use the following
# DO NOT USE BOTH
#
#RewriteCond %{HTTP_HOST} .
#RewriteCond %{HTTP_HOST} !^www\.example-domain-please-change\.com [NC]
#RewriteRule (.*) http://www.example-domain-please-change.com/$1 [R=301,L]



# Rewrite secure requests properly to prevent SSL cert warnings, e.g. prevent 
# https://www.domain.com when your cert only allows https://secure.domain.com
#RewriteCond %{SERVER_PORT} !^443
#RewriteRule (.*) https://example-domain-please-change.com/$1 [R=301,L]

RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

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

Rewrite www.domain.com -> domain.com -- used with SEO Strict URLs plugin
RewriteCond %{HTTP_HOST} .
RewriteCond %{HTTP_HOST} !^example-domain-please-change\.com [NC]
RewriteRule (.*) http://example-domain-please-change.com/$1 [R=301,L]

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