nested errors

in account model:
accepts_nested_attributes_for :from_adrs, :allow_destroy => true

in from_adr model:
   validates_format_of :email,
      :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i,
      :message => 'email must be valid'

form:
<%form_for @account do |f|%>
    <%=f.error_messages%>
         <%f.fields_for :from_adrs do |f2|%>                        
              <%=f2.text_field :email%>
         <%end%>
    <%=f.submit "Save"%>
<%end%>