|| fprintf(out, "MIME-Version: 1.0\r\n") < 0
|| fprintf(out, "Content-Type: %s\r\n", content_type) < 0
|| fprintf(out, "Content-Transfer-Encoding: %s\r\n", encoding) < 0
|| fprintf(out, "MIME-Version: 1.0\r\n") < 0
|| fprintf(out, "Content-Type: %s\r\n", content_type) < 0
|| fprintf(out, "Content-Transfer-Encoding: %s\r\n", encoding) < 0