Example

    preprocessor SMTP: \
        ports { 25 } \
        inspection_type stateful \
        normalize cmds \
        normalize_cmds { EXPN VRFY RCPT } \
        ignore_data \
        ignore_tls_data \
        max_command_line_len  512 \
        max_header_line_len   1024 \
        max_response_line_len 512 \
        no_alerts \
        alt_max_command_line_len 300 { RCPT } \
        invalid_cmds { } \
        valid_cmds { } \
        xlink2state { disable } \
	print_cmds \
	log_filename \
	log_email_hdrs \
	log_mailfrom \
	log_rcptto \
	email_hdrs_log_depth 2920 \
	memcap 6000

    preprocessor SMTP: \
	b64_decode_depth 0\
        max_mime_mem 4000 \
	memcap 6000 \
	email_hdrs_log_depth 2920 \
	disabled