[COURIER] Authentication failure - Brute Force [5/5]

alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER] Authentication failure - Brute Force [5/5]"; content: "LOGIN FAILED,"; parse_src_ip: 1; xbits: set,brute_force,track ip_src, expire 21600; after: track by_src, count 5, seconds 300; threshold: type suppress, track by_src, count 1, seconds 300; default_proto: tcp; classtype: brute-force; program: imapd
| imapd-sslcourierlogger; sid:5002398; rev:7;)