zammad/app/views/robots_txt/index.text.erb

# See http://www.robotstxt.org/robotstxt.html for documentation on how to use the robots.txt file
#
User-Agent: *
<% if custom_path? %>
Allow: <%= custom_address_uri.path %>
Disallow: /
<% elsif custom_domain_path? %>
Allow: /
<% else %>
Allow: /help/
Disallow: /
<% end %>