# File lib/sup/mbox/loader.rb, line 116
  def store_message date, from_email, &block
    need_blank = File.exists?(@filename) && !File.zero?(@filename)
    File.open(@filename, "ab") do |f|
      f.puts if need_blank
      f.puts "From #{from_email} #{date.rfc2822}"
      yield f
    end
  end