def method_missing(meth, *args, &block)
       if mail.respond_to?(meth)
         mail.send(meth, *args, &block)
       else
         super
       end
    end
def method_missing(meth, *args, &block)
       if mail.respond_to?(meth)
         mail.send(meth, *args, &block)
       else
         super
       end
    end
Proxy all other methods to this instance's Mail::Message