policy-map type inspect esmtp default_esmtp_map
 description Default ESMTP policy-map
 parameters
  mask-banner
  no mail-relay
  no special-character
  no allow-tls
 match cmd line length gt 512
  drop-connection log
 match cmd RCPT count gt 100
  drop-connection log
 match body line length gt 998
  log
 match sender-address length gt 320
  drop-connection log
 match MIME filename length gt 255
  drop-connection log
 match ehlo-reply-parameter others
  mask

policy-map global_policy
 class inspection_default
  inspect esmtp default_esmtp_map