a ver si con esto se arregla

app/models/site/forms.rb

@@ -11,8 +11,6 @@ class Site
       # @return Array
       def params
         map do |field, definition|
-          next if EXCLUDED_FIELDS.include? definition['type']
-
           if ARRAY_FIELDS.include? definition['type']
             { field.to_sym => [] }
           else
@@ -21,6 +19,9 @@ class Site
         end.compact
       end
 
+      # Obtiene la traducción del campo
+      #
+      # @return String
       def t(field)
         dig(field.to_s, 'label', I18n.locale.to_s)
       end
@@ -46,12 +47,17 @@ class Site
       forms.include? name.to_s
     end
 
-    # Obtiene un formulario
+    # Obtiene un formulario con los campos definitivos
     #
     # @return Site::Forms::Form
     def form(name)
       @cached_forms ||= {}
-      @cached_forms[name] ||= Form[data.dig('forms', name)]
+      @cached_forms[name] ||= Form[data.dig('forms', name).reject { |k,_| excluded? k }]
+    end
+
+    # Detecta si el campo está excluido del formulario final
+    def excluded?(field)
+      EXCLUDED_FIELDS.include? field.to_s
     end
   end
 end

app/views/contact_mailer/notify_usuaries.html.haml

@@ -1,4 +1,4 @@
 - @params[:form].each do |field, value|
   %p
-    %strong= @params[:form_definition].t(field) || field + ':'
+    %strong= @params[:form_definition].t(field) + ':'
     = value

app/views/contact_mailer/notify_usuaries.text.haml

@@ -1,3 +1,3 @@
 - @params[:form].each do |field, value|
-  "#{@params[:form_definition].t(field) || field}: #{value}"
+  "#{@params[:form_definition].t(field)}: #{value}"
   \