# File lib/mail/message.rb, line 1352 def add_content_transfer_encoding if body.only_us_ascii? header[:content_transfer_encoding] = '7bit' else warning = "Non US-ASCII detected and no content-transfer-encoding defined.\nDefaulting to 8bit, set your own if this is incorrect.\n" STDERR.puts(warning) header[:content_transfer_encoding] = '8bit' end end