posting comments -> 127.0.0.1 on multisite with domain mapping

this RewriteRule is added when Block Spambot Comments is activated:

#AIOWPS_BLOCK_SPAMBOTS_START
<IfModule mod_rewrite.c>
RewriteCond %{REQUEST_METHOD} POST
RewriteCond %{REQUEST_URI} ^(.*)?wp-comments-post\.php(.*)$
RewriteCond %{HTTP_REFERER} !^http(s)?://.*\.example\.com [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^$
RewriteRule .* https://127.0.0.1 [L]
</IfModule>
#AIOWPS_BLOCK_SPAMBOTS_END

but on a multisite installation with domain mapping every site can have its own domain, those domains are not taken into account with the above rule, so this breaks comments for all those sites.

a possible solution would be to add all primary domains with comments enabled to the regex like:
!^http(s)?://.*\.(example\.com|example2.com|example3.com)
but i am not sure how well this will perform/work with many domains.

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