docuseal/app/views/shared/_email_attribution.html.erb

<p>
  ---
</p>
<p>
  <% if @current_account&.testing? %>
    <%= t('sent_using_product_name_via_developer_sandbox_html', product_url: "#{Docuseal::PRODUCT_EMAIL_URL}/start", product_name: Docuseal.product_name) %>
  <% else %>
    <%= t('sent_using_product_name_free_document_signing_html', product_url: "#{Docuseal::PRODUCT_EMAIL_URL}/start", product_name: Docuseal.product_name) %>
  <% end %>
</p>