to All: fail2ban install centos5.9. I am looking to create a conf file for fail2ban that contains the proper regex expression that bans repeat offenders that show up in the maillogs. The maillogs show the following: [2013/01/10 05:25:14] [36.224.203.36:27304] User sl.wang login failed. [2013/01/10 05:45:17] [36.224.203.36:30613] User sl.wang login failed. [2013/01/10 06:34:54] [36.224.203.36:7021] User sl.wang login failed. [2013/01/10 07:24:59] [36.224.203.36:15711] User sl.wang login failed. [2013/01/10 07:45:02] [36.224.203.36:19712] User sl.wang login failed. [2013/01/10 07:55:03] [36.224.203.36:21755] User sl.wang login failed. And I tried the following but to no avail: failregex = ^\[\d{1,4}\/d{1,2}\/d{1,2}.\d{1,2}:\d{1,2}:\d{1,2}\] \[<HOST>:.*].User.*.login failed Any ideas?