# File lib/sup/poll.rb, line 156
  def each_message_from source, opts={}
    begin
      return if source.done? || source.has_errors?

      source.each do |offset, source_labels|
        if source.has_errors?
          warn "error loading messages from #{source}: #{source.error.message}"
          return
        end

        m = Message.build_from_source source, offset
        m.labels += source_labels + (source.archived? ? [] : [:inbox])
        m.labels.delete :unread if m.source_marked_read? # preserve read status if possible
        m.labels.each { |l| LabelManager << l }

        HookManager.run "before-add-message", :message => m
        yield m
      end
    rescue SourceError => e
      warn "problem getting messages from #{source}: #{e.message}"
      Redwood::report_broken_sources :force_to_top => true
    end
  end